JP2019039516A - Fixing structure for bearing - Google Patents

Abstract

To provide a fixing structure for a bearing capable of avoiding, as further as possible, appearance of undesired distortion in an upper structure when installing or exchanging the bearing, by reducing lifting of the upper structure using a jack or the like as further as possible when installing or exchanging the bearing.SOLUTION: In a fixing structure 1, in order to suppress transmission of displacement of a foundation 2 in a horizontal direction H to an upper skeleton 3, a lower mounting plate 6 for fixing a multilayer rubber device 4 which is disposed between the upper skeleton 3 and the foundation 2, to the upper skeleton 3 and the foundation 2 in the multilayer rubber device 4 is fixed to a lower male screw part 9 which protrudes upwards from a top face 8 of the foundation 2 in each of lower anchor bolts 7 installed in the foundation 2, via a fixing member 10 which is threaded to the lower male screw part 9. An upper mounting plate 5 is fixed to an upper male screw part 13 which protrudes downwards from a bottom face 12 of the upper skeleton 3 in each of upper anchor bolts 11 installed in the upper skeleton 3, via a fixing member 14 which is threaded to the upper male screw part 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structure for fixing a support to an upper structure and a lower structure.

  A base body having an elastic layer and a rigid layer that are alternately stacked, and an upper mounting plate and a lower mounting plate that are fixed to the upper end surface and the lower end surface of the stacked body, and is used for seismic isolation support of the upper structure. Seismic bearings are known as an example of one bearing.

  Such a seismic isolation device is arranged between the upper structure and the lower structure, and is fixed to the upper structure via the upper mounting plate and to the lower structure via the lower mounting plate, respectively. Therefore, the transmission of the horizontal displacement of the lower structure due to the earthquake to the upper structure is suppressed by elastic deformation (shear deformation) of the laminate.

JP 2000-65136 A JP 2003-294082 A

  By the way, in this type of seismic isolation bearing, each of the upper structure and the lower structure is fixed by installing through holes in the upper mounting plate and the lower mounting plate in the upper structure and the lower structure, respectively. It is positioned in the male screw portion of the anchor bolt, and a nut is screwed into the male screw portion protruding from the upper mounting plate and the lower mounting plate, and the upper structure plate and the lower structure plate are connected to the upper structure and the lower structure by the nut. In such a fixed structure, when replacing the seismic isolation bearing, the upper structure is inserted with a jack or the like longer than the length of the male screw protruding from the upper structure and the lower structure. If it is not lifted, it is difficult to take out the seismic isolation support device between the upper structure and the lower structure, and to place a new seismic isolation support, which may cause undesired distortion to the upper structure. Favorable to things In granting the distortion, not help but not cutting the male screw portion.

  Such a problem is not limited to seismic isolation bearings having a laminated body, but is disposed between an upper structure and a lower structure, for example, a sliding member or a rolling member is disposed between an upper arm and a lower arm. It can also occur with a seismic isolation bearing.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to reduce the lifting of the upper structure with a jack or the like as much as possible when installing or replacing the support. It is an object of the present invention to provide a fixing structure for a bearing that can avoid the occurrence of undesirable distortion as much as possible.

  The present invention relates to a lower mounting plate among an upper mounting plate and a lower mounting plate for fixing the support in a support disposed between the upper structure and the lower structure to the upper structure and the lower structure. The lower anchor bolt installed in the lower structure is fixed to the lower male screw portion protruding upward from the upper surface of the lower structure via a fixing member screwed into the lower male screw portion. The lower mounting plate is a fixing structure for the lower structure, and the lower mounting plate has a through hole that receives the lower male screw portion, and the fixing member is attached to the male screw of the lower male screw portion. A female screw portion having a female screw that is screwed together and surrounding the lower male screw portion in the through-hole, and a single screw provided on the upper surface of the lower mounting plate around the through-hole and provided integrally with the female screw portion. And a collar portion having an annular surface for applying pressure.

  According to the present invention, the lower male screw portion can be terminated at the through hole, and as a result, the amount of protrusion of the lower male screw portion upward from the upper surface of the lower structure can be reduced. To avoid lifting the upper structure with a jack to avoid the lower male screw when installing or replacing the bearing, minimize the occurrence of undesirable distortion in the upper structure when installing or replacing the bearing. On the other hand, large work such as cutting of the lower male screw portion can be avoided.

  The present invention also provides an upper mounting plate and an upper mounting plate for fixing the support in the support disposed between the upper structure and the lower structure to the upper structure and the lower structure. The mounting plate is fixed to the upper male screw portion protruding downward from the lower surface of the upper structure in the upper anchor bolt installed in the upper structure via a fixing member screwed into the upper male screw portion. The upper mounting plate is a fixing structure for the upper structure, and the upper mounting plate has a through hole that receives the upper male screw portion, and the fixing member is screwed into the male screw of the upper male screw portion. A female screw portion having a female screw and surrounding the upper male screw portion in the through hole, and a concave pressure is applied to the lower surface of the upper mounting plate around the through hole while being provided integrally with the female screw portion. And a collar portion having an annular surface.

  Also according to the present invention, as a result of the upper male screw portion being terminated by the through hole, the amount of the upper male screw portion protruding downward from the lower surface of the upper structure can be reduced. While it is possible to minimize lifting of the upper structure by a jack or the like for avoiding the upper male screw portion during installation or replacement, it is possible to avoid the occurrence of undesirable distortion in the upper structure as much as possible during installation or replacement of the bearing. Large work such as cutting of the upper male screw portion can be avoided.

  As described above, the present invention may have a structure for fixing the support with the upper mounting plate, or alternatively, may have a structure for fixing the support with the lower mounting plate. It is preferable that the support fixing structure of the present invention is adopted for both the mounting plate and the lower mounting plate because the effects of the present invention can be obtained twice.

  In the present invention, the lower mounting plate has an inner peripheral surface that defines a through hole that receives the lower male screw portion. With respect to such a lower mounting plate, the female screw portion is a cylindrical outer peripheral surface thereof. Even if it is arranged in the through hole with a gap with respect to the cylindrical inner peripheral surface that defines the through hole, the cylindrical outer peripheral surface makes contact with the cylindrical inner peripheral surface that defines the through hole to form the through hole. Similarly, the upper mounting plate has an inner peripheral surface that defines a through hole that receives the upper male screw portion. With respect to such an upper mounting plate, the female screw portion has a cylindrical shape. Even if it is arranged in the through hole with a gap with respect to the cylindrical inner peripheral surface defining the through hole on the outer peripheral surface of the shape, it contacts the cylindrical inner peripheral surface defining the through hole on the cylindrical outer peripheral surface And may be arranged in the through hole.

  When the female screw portion relating to the lower mounting plate is disposed in the through hole in contact with the cylindrical inner peripheral surface defining the through hole of the lower mounting plate on the cylindrical outer peripheral surface thereof, and the female screw relating to the upper mounting plate When the screw part is arranged in the through hole in contact with the cylindrical inner peripheral surface that defines the through hole of the upper mounting plate on its cylindrical outer peripheral surface, the lower mounting plate or upper Even if the tightening of the mounting plate is loosened, the horizontal displacement of the lower mounting plate relative to the lower structure or the horizontal displacement of the upper mounting plate relative to the upper structure can be prevented, and a fail-safe support fixing structure can be provided.

  In a preferred example of the present invention, the lower male screw portion protrudes upward from the upper surface of the lower structure with a length of 0.8 times or more the diameter of the lower male screw portion, and the upper male screw portion is It protrudes downward from the lower surface of the upper structure with a length of 0.8 times or more the diameter of the upper male screw portion.

  In another preferred example of the present invention relating to the support fixing structure of the lower mounting plate, the female screw portion has a recess that opens toward the upper surface of the lower structure and receives the lower male screw portion. The recess ceiling surface is defined by the surface of the female screw portion facing the opening surface of the recess, and the surface of the female screw portion defining the ceiling surface of the recess and the lower male screw portion Another preferable example of the present invention according to the fixing structure of the support with the upper mounting plate is provided with a surface that receives the rotational force for fixing. Then, the female screw part is provided with a recess that is open toward the lower surface of the upper structure and receives the upper male screw part, and the bottom surface of the recess is a female that faces the opening surface of the recess. It is defined by the surface of the screw portion, and there is a gap between the surface of the female screw portion that defines the bottom surface of the recess and the lower end surface of the upper male screw portion. And facing flange portion is provided with a surface for receiving the rotational force for fixing.

  In the present invention, the lower structure includes an abutment or a pier of a bridge including a road bridge such as an expressway, or a general business building, an apartment house or a foundation of a detached house, or a lower housing, and the upper structure is Including bridge girders including road bridges such as expressways or upper structures of general business buildings, apartment houses or detached houses.

  In the present invention, examples of the bearing may include a laminated rubber bearing using laminated rubber and a sliding or rolling bearing in which a sliding member or a rolling member is disposed between the upper collar and the lower collar, but is not limited thereto. Other bearings may be used.

  In the present invention, the upper mounting plate and the lower mounting plate may have a circular or elliptical outer edge, or may instead have a rectangular or rectangular outer edge.

  According to the present invention, it is possible to minimize the lifting of the upper structure with a jack or the like when installing or replacing the bearing, and to avoid the occurrence of undesirable distortion in the upper structure when installing or replacing the bearing as much as possible. A fixed structure can be provided.

FIG. 1 is a partially broken explanatory view of a specific example of a preferred embodiment of the present invention. FIG. 2 is an explanatory plan view of the upper mounting plate in the example of FIG. FIG. 3 is an enlarged cross-sectional explanatory view of a part of the lower mounting plate side in the example of FIG. 4 is a cross-sectional explanatory view taken along the line IV-IV shown in FIG. FIG. 5 is a perspective explanatory view of the lower fixing member in the example of FIG. 1. 6 is an explanatory plan view of the lower mounting plate in the example of FIG. 7 is an enlarged cross-sectional explanatory view of a part on the upper mounting plate side in the example of FIG. FIG. 8 is a perspective explanatory view of the upper fixing member in the example of FIG. 1.

  Next, embodiments of the present invention will be described in detail based on preferred specific examples shown in the drawings. The present invention is not limited to these examples.

  1 to 8, the fixing structure 1 of this example is a transmission of a horizontal displacement H of a foundation 2 made of concrete, for example, as a lower structure to an upper housing 3 of, for example, a business building as an upper structure. In order to suppress this, an upper mounting plate 5 for fixing the laminated rubber device 4 in the laminated rubber device 4 as a support disposed between the upper housing 3 and the foundation 2 to the upper housing 3 and the foundation 2 and The lower mounting plate 6 of the lower mounting plate 6 is placed on the lower male screw portion 9 protruding upward from the upper surface 8 of the base 2 in each of the plurality of lower anchor bolts 7 installed on the base 2. The upper mounting plate 5 of the upper mounting plate 5 and the lower mounting plate 6 is fixed to a plurality of upper sides that are installed in the upper housing 3. The lower surface 12 of the upper housing 3 in each of the anchor bolts 11 The upper male screw portion 13 that protrudes Luo downward, is fixed via a fixing member 14 screwed to the upper male screw portion 13.

  In the laminated rubber device 4, in addition to the disk-shaped upper mounting plate 5 and the lower mounting plate 6, a circular upper end surface 21 is fixed to the circular lower surface 22 of the upper mounting plate 5 by vulcanization adhesion or the like. A circular lower end surface 23 is provided with a laminate 25 fixed to the circular upper surface 24 of the lower mounting plate 6 by vulcanization adhesion or the like.

  The laminated body 25 includes a plurality of disk-shaped rubber plates 31 as a plurality of elastic layers, a plurality of disk-shaped steel plates 32 as a plurality of rigid layers, and outer peripheral surfaces 33 of the rubber plates 31 and the steel plates 32. And a cylindrical rubber coating 35 that is vulcanized and bonded to the outer peripheral surfaces 33 and 34, and the plurality of rubber plates 31 and the plurality of steel plates 32 are upper mounting plates. From 5 to the lower mounting plate 6, in other words, they are alternately stacked in the vertical direction V.

  The upper mounting plate 5 having a circular upper surface 41 and a cylindrical side surface 42 in addition to the lower surface 22 receives each of the plurality of upper male screw portions 13 and is equally spaced in the circumferential direction R. It has a plurality of arranged columnar through holes 43 and a cylindrical inner peripheral surface 44 that defines each of the plurality of through holes 43, and the upper surface 41 contacts the lower surface 12 of the upper housing 3. The upper male screw part 13 and the fixing member 14 screwed to the upper male screw part 13 are fixed to the upper housing 3.

  The lower mounting plate 6 having a circular lower surface 51 and a cylindrical side surface 52 in addition to the upper surface 24 receives a plurality of lower male screw portions 9 and is equally spaced in the circumferential direction R. A plurality of cylindrical through holes 53 and a cylindrical inner peripheral surface 54 defining each of the plurality of through holes 53, and the lower surface 51 contacts the upper surface 8 of the foundation 2. The lower male screw portion 9 and the fixing member 10 screwed to the lower male screw portion 9 are fixed to the foundation 2.

  Each of the plurality of lower anchor bolts 7 has a cylindrical shape that is integrated with the lower male screw portion 9 and embedded in the foundation 2 in addition to the cylindrical lower male screw portion 9 having the male screw 61. The lower male screw portion 9 has a diameter D1 of the lower male screw portion 9, in other words, 0.8 times the diameter D1 of the lower anchor bolt base portion 62. It protrudes from the upper surface 8 of the foundation 2 with the above length L1 (<t1).

  The fixing member 10 has a female screw 65 threadedly engaged with the male screw 61 of the lower male screw portion 9 and a cylindrical female screw portion 66 surrounding the lower male screw portion 9 in the through hole 53, and a female screw. A pressing force (clamping force) that is provided integrally with the portion 66 and that is brought into contact with the upper surface 24 of the lower mounting plate 6 around the through-hole 53 and is engaged with the male screw 61 and the female screw 65 on the upper surface 24 ) Having a hexagonal annular surface 67 to which the female screw portion 66 is provided. The female screw portion 66 is opened toward the upper surface 8 of the foundation 2 and receives the lower male screw portion 9. A cylindrical recess 69, an annular end surface 71 facing the upper surface 8 of the foundation 2 with an annular gap 70, a cylindrical inner peripheral surface 72 in which a female screw 65 is formed, and an inner peripheral surface 72 A recess that defines the recess 69 in cooperation with the recess and faces the opening surface of the recess 69 9 has a circular surface 74 defining a ceiling surface 73 and a cylindrical outer peripheral surface 75, and the collar portion 68 is an outer periphery made up of six rectangular surfaces as surfaces for receiving a fixing rotational force. The surface 76 and the hexagonal end surface 77 are provided, and the circular surface 74 which is the surface of the female screw portion 66 defining the ceiling surface 73 of the recess 69 and the circular upper end surface 78 of the lower male screw portion 9. And the female screw portion 66 has a cylindrical gap 80 with respect to the cylindrical inner peripheral surface 54 that defines the through-hole 53 at the cylindrical outer peripheral surface 75. The fixing member 10 is arranged in the through hole 53, and the fixing member 10 fixes the lower mounting plate 6 to the upper surface 8 of the foundation 2 by applying a pressing force to the upper surface 24 by the flange 68. .

  Like the lower anchor bolt 7, each of the plurality of upper anchor bolts 11 is integrated with the upper male screw portion 13 in addition to the columnar upper male screw portion 13 having the male screw 91, and the upper casing 3. The upper male screw portion 13 has a diameter D2 of the upper male screw portion 13, in other words, 0 of the diameter D2 of the upper anchor bolt base portion 92. It protrudes from the lower surface 12 of the upper housing 3 with a length L2 (<t2) of 8 times or more.

  Similarly to the fixing member 10, the fixing member 14 has a female screw 95 that is screwed into the male screw 91 of the upper male screw portion 13, and a cylindrical female screw portion that surrounds the upper male screw portion 13 in the through hole 43. 96 and the female screw portion 96, and is brought into contact with the lower surface 22 of the upper mounting plate 5 around the through-hole 43, and the lower surface 22 is caused by screwing of the male screw 91 and the female screw 95. And a flange 98 having a hexagonal annular surface 97 for applying a pressing force (tightening force). A cylindrical recess 99 that receives the screw portion 13, an annular end surface 101 that faces the lower surface 12 of the upper housing 3 with an annular gap 100, and a cylindrical inner peripheral surface 102 in which a female screw 95 is formed. In cooperation with the inner peripheral surface 102, the recess 9 And a circular surface 104 that defines the bottom surface 103 of the recess 99 facing the opening surface of the recess 99, and a cylindrical outer peripheral surface 105, and the flange 98 has a rotational force for fixing. A circular surface 104 which is a surface of the female screw portion 96 defining the bottom surface 103 of the recess 99. And the circular lower end surface 108 of the upper male screw portion 13 face each other with a columnar gap 109, and the female screw portion 96 has a cylindrical inner surface that defines the through-hole 43 by its cylindrical outer peripheral surface 105. The fixing member 14 is disposed in the through hole 43 with a cylindrical gap 110 with respect to the peripheral surface 44, and the fixing member 14 is applied with a pressing force to the lower surface 22 by the flange portion 98, so that the lower surface 12 of the upper housing 3 is provided. The upper mounting plate 5 is fixed to the top.

  The laminated rubber device 4 fixed between the base 2 and the upper housing 3 by being fixed to the base 2 by the lower mounting plate 6 and the upper housing 3 by the upper mounting plate 5 by the fixing structure 1 described above is an earthquake or the like. When the foundation 2 is displaced (vibrated) in the horizontal direction H with respect to the upper casing 3, the laminated body 25 is shear-deformed in the horizontal direction H, and the displacement (vibration) of the foundation 2 is transmitted to the upper casing 3 by this shear deformation. Is supposed to suppress.

  According to the fixing structure 1, since the fixing member 10 has the female screw portion 66 screwed into the male screw 61, the lower male screw portion 9 can be terminated at the through hole 53. In other words, the length L1 of the lower male screw portion 9 protruding from the upper surface 8 of the base 2 can be made smaller than the thickness t1 of the lower mounting plate 6, and as a result, the lower male screw portion 9 from the upper surface 8 of the base 2 The amount of upward protrusion can be reduced, and thus the rotational force in the circumferential direction R is applied to the outer peripheral surface 76 of the flange portion 68 and the female screw portion 66 is rotated in the circumferential direction R via the flange portion 68. Then, the screwing of the male screw 61 and the female screw 65 is released, the fixing member 10 is removed, the laminated rubber device 4 is moved in the horizontal direction H, and the upper housing 3 when replacing the existing laminated rubber device 4 By removing the laminated rubber device 4 in the horizontal direction H between the base 2 and the jack of the upper housing 3 etc. The lifting can be reduced as much as possible, and the occurrence of undesired distortion in the upper housing 3 during such removal can be avoided as much as possible, while large work such as cutting of the lower male screw portion 9 can be avoided, and Since the fixing member 14 has the female screw portion 96 screwed to the male screw 91, the upper male screw portion 13 can be terminated at the through hole 43, in other words, the upper housing 3. The length L2 of the upper male screw portion 13 protruding from the lower surface 12 can be made smaller than the thickness t2 of the upper mounting plate 5. As a result, the downward protrusion amount of the upper male screw portion 13 from the lower surface 12 of the upper housing 3 is reduced. Thus, a rotational force in the circumferential direction R is applied to the outer peripheral surface 106 of the flange portion 98, and the female screw portion 96 is similarly rotated in the circumferential direction R via the flange portion 98. The screw 95 is released and the fixing member 14 is removed, By moving the rubber device 4 in the horizontal direction H and removing the laminated rubber device 4 in the horizontal direction H between the upper housing 3 and the base 2 when the existing laminated rubber device 4 is replaced, a jack for the upper housing 3 is obtained. The lifting due to, for example, can be reduced as much as possible, and the occurrence of undesired distortion in the upper housing 3 in such removal can be avoided as much as possible, while large work such as cutting of the upper male screw portion 13 can be avoided. Then, the existing laminated rubber device 4 can be replaced by lifting the amount smaller than (t1 + t2) and exceeding (L1 + L2) by the jack of the upper housing 3 or the like.

  The surface that receives the rotational force for fixing is an inner peripheral surface that defines hexagonal recesses formed in the end surfaces 77 and 107, instead of the outer peripheral surface 76 and the outer peripheral surface 106, which are six rectangular surfaces. May be.

DESCRIPTION OF SYMBOLS 1 Fixed structure 2 Base 3 Upper housing 4 Laminated rubber apparatus 5 Upper mounting plate 6 Lower mounting plate 7 Lower anchor bolt 8 Upper surface 9 Lower male screw part 10, 14 Fixing member 11 Upper anchor bolt 12 Lower surface 13 Upper male screw part

Claims (12)

  The lower mounting plate of the upper mounting plate and the lower mounting plate for fixing the support in the support disposed between the upper structure and the lower structure to the upper structure and the lower structure is used as the lower structure. The lower mounting plate of the support fixed to the lower male screw part protruding upward from the upper surface of the lower structure in the lower anchor bolt installed in the object via the fixing member screwed to the lower male screw part The lower mounting plate has a through hole that receives the lower male screw portion, and the fixing member is a female screwed into the male screw of the lower male screw portion. A female screw portion that has a screw and surrounds the lower male screw portion in the through hole, and is provided integrally with the female screw portion and applies a pressing force to the upper surface of the lower mounting plate around the through hole. A fixing structure of a bearing having a collar portion having an annular surface.   The lower mounting plate has an inner peripheral surface that defines a through hole that receives the lower male screw portion, and the female screw portion has a cylindrical inner peripheral surface that defines a through hole at the cylindrical outer peripheral surface thereof. The support fixing structure according to claim 1, wherein the support fixing structure is disposed in the through hole with a gap.   The lower mounting plate has an inner peripheral surface that defines a through hole that receives the lower male screw portion, and the female screw portion has a cylindrical inner peripheral surface that defines a through hole at the cylindrical outer peripheral surface thereof. The support fixing structure according to claim 1, wherein the structure is disposed in the through hole in contact with the contact hole.   The support according to any one of claims 1 to 3, wherein the lower male screw portion protrudes upward from the upper surface of the lower structure with a length of 0.8 times or more the diameter of the lower male screw portion. Fixed structure.   The female screw portion has a recess that is open toward the upper surface of the lower structure and receives the lower male screw portion, and the ceiling surface of the recess is a female facing the opening surface of the recess. The surface of the screw portion is defined, and the surface of the female screw portion that defines the ceiling surface of the recess and the upper end surface of the lower male screw portion face each other with a gap. The fixing structure of the bearing described in the paragraph.   The support fixing structure according to any one of claims 1 to 5, wherein the flange portion includes a surface that receives a fixing rotational force.   The upper mounting plate of the upper mounting plate and the lower mounting plate for fixing the support in the support disposed between the upper structure and the lower structure to the upper structure and the lower structure is used as the upper structure. The upper part of the upper mounting plate fixed to the upper male screw part protruding downward from the lower surface of the upper structure of the upper anchor bolt installed on the object through the fixing member screwed into the upper male screw part. The upper mounting plate has a through-hole that receives the upper male screw portion, and the fixing member has a female screw that is screwed into the male screw of the upper male screw portion and penetrates the upper mounting plate. A female screw part that surrounds the upper male screw part in the hole, and a hook that is provided integrally with the female screw part and has an annular surface that applies a concave pressure to the lower surface of the upper mounting plate around the through hole. And a support fixing structure.   The upper mounting plate has an inner peripheral surface that defines a through hole that receives the upper male screw portion, and the female screw portion is formed on a cylindrical inner peripheral surface that defines the through hole by the cylindrical outer peripheral surface. The support fixing structure according to claim 7, wherein the structure is arranged in the through hole with a gap.   The upper mounting plate has an inner peripheral surface that defines a through hole that receives the upper male screw portion, and the female screw portion is formed on a cylindrical inner peripheral surface that defines the through hole by the cylindrical outer peripheral surface. The support fixing structure according to claim 7, wherein the fixing structure is in contact with the through hole.   The fixing of the bearing according to any one of claims 7 to 9, wherein the upper male screw portion protrudes downward from the lower surface of the upper structure with a length of 0.8 times or more the diameter of the upper male screw portion. Construction.   The female screw portion has a recess that is open toward the lower surface of the upper structure and receives the upper male screw portion, and the bottom surface of the recess has a female screw portion that faces the opening surface of the recess. The surface of the female screw portion that defines the bottom surface of the recess and the lower end surface of the upper male screw portion face each other with a gap. Fixed structure of the bearing. The support fixing structure according to any one of claims 7 to 11, wherein the flange portion includes a surface that receives a fixing rotational force.

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