JP2008303530A - Base-isolating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a base-isolating device which enables the inexpensive application of rustproofing treatment to a sliding contact portion. <P>SOLUTION: In a shear key 26, a protrusive streak 27 is formed at a portion fitted into an upper keyhole 24, that is, the top of the outer periphery of the shear key 26. The protrusive streak 27 which has the side of the outer periphery of a lateral cross section formed in an arc shape (round shape) is constituted in such a manner as to make a round in the circumferential direction of the shear key 26. A key-side contact member 28 which is composed of stainless steel is mounted to the outside of the protrusive streak 27. The key-side contact member 28 is formed in an arc shape (round shape) so as to be capable of covering the outside of the protrusive streak 27. A hole-side contact member 25 is mounted to a lateral inner wall which constitutes an upper keyhole 24 of an upper shoe 20, that is, in a position to face the key-side contact member 28. The hole-side contact member 25 is formed in a batten plate shape and composed of stainless steel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seismic isolation device used for a bridge or the like, and more particularly, a seismic isolation device in which a function of supporting a vertical load and a function of elastically supporting a horizontal load are separated, and the seismic isolation device having the latter function About.

  2. Description of the Related Art In recent years, seismic isolation devices that separate a function for supporting a vertical load and a function for supporting a horizontal load have been developed in seismic isolation devices used for bridges and the like. For example, Patent Document 1 discloses an apparatus in which a horizontal load is elastically supported.

  A device having a function of supporting a horizontal load, such as the device described in Patent Document 1, requires a structure that allows relative movement between the upper structure and the lower structure. Therefore, in Patent Document 1, a shear key is fitted into a key hole formed in an upper collar so as to be relatively rotatable.

  Thus, in the structure part which accept | permits a relative movement, since there exists sliding contact between members, it is easy to wear and the countermeasure against rust is required.

However, if the entire shear key is made of a material having an antirust effect, the cost becomes high.
JP 2003-138518 A

  The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a seismic isolation device capable of performing rust prevention of a sliding contact portion at low cost.

  The seismic isolation device according to claim 1 is a seismic isolation device that is installed between a support member and a supported member and supports a horizontal load, and is fixed to the lower side of the supported member, An upper keyhole having an upper keyhole; an upper connecting plate having a lower keyhole at a position facing the upper keyhole on the upper surface side and spaced apart from the upper key; and an upper side of the support member Fitted into a rubber bearing having a lower connecting plate fixed to the upper connecting plate and a rubber portion disposed between the upper connecting plate and the lower connecting plate, and the upper key hole and the lower key hole, A shear key that allows relative rotation between the heel and the upper connecting plate, and that connects the upper heel and the upper connecting plate, and a sliding contact that is in sliding contact with the shear key of the upper heel and the upper connecting plate. A hole-side contact member made of stainless steel, A key-side contact member made of stainless steel, mounted at a position facing the hole-side contact member of the break key, wherein one of the hole-side contact member or the key-side contact member is The contact surface has an arc shape protruding to the other side.

  The seismic isolation device according to claim 1 includes an upper arm fixed to the lower side of the supported member, a lower arm fixed to the upper side of the supporting member, and a rubber bearing disposed between the upper arm and the lower arm. It is equipped with. The upper and lower eyelids may be directly fixed to the indicated member and the support member, or may be fixed via a base plate or the like.

  In the seismic isolation device according to the first aspect, the upper collar and the upper coupling plate of the rubber bearing are coupled by a shear key. The shear key is moved relative to at least one of the upper collar and the upper coupling plate in order to allow relative rotation between the upper collar and the upper coupling plate. By this relative movement, at least one of the upper collar and the upper coupling plate is brought into sliding contact. One or both of the upper collar and the upper connecting plate that are slidably contacted with each other is provided with a hole-side contact member made of stainless steel at the slidable contact portion. The shear key is provided with a key side contact member made of stainless steel at a position facing the hole side contact member.

  According to the above configuration, the portion made of stainless steel is provided in the portion where the shear key, the upper collar, and the upper connecting plate are in sliding contact with each other, so that rust can be prevented.

  The seismic isolation device according to claim 2, wherein at least one of an upper part and a lower part of the side circumferential surface of the shear key is configured with an arc-shaped protrusion projecting toward the hole side contact member side in the circumferential direction, The key-side contact member is arranged so as to cover the protrusion along the protrusion.

  In this way, a protruding shape is formed on the side peripheral surface of the shear key, and the key side contact member is arranged so as to cover the protrusion, thereby forming the arc side shape in which the key side contact member protrudes toward the hole side contact member. Can do.

  The seismic isolation device according to claim 3, wherein the key-side contact member has a semicircular side cross section, and the side cross-section straight side of the key-side contact member is attached to a side end surface of the shear key. Features.

  As described above, the key-side contact member can be formed into an arc shape protruding toward the hole-side contact member by making the side cross section of the key-side contact member semicircular.

  The seismic isolation device according to claim 4, wherein the hole-side contact member has a semicircular side cross section, and a side cross-sectional straight line side of the hole-side contact member is attached to the sliding contact portion. To do.

  Thus, by making the side cross section of the hole side contact member semicircular, the hole side contact member can be formed into an arc shape protruding toward the key side contact member.

  Since this invention was set as the said structure, it can rust-proof a sliding contact part at low cost.

  FIG. 1 shows a cross-sectional view of a seismic isolation device 14 according to an embodiment of the present invention. In this embodiment, the seismic isolation device 14 is installed between the bridge pier 10 which is a supporting member and the bridge girder 12 which is a supported member. A support (not shown) is installed in the vicinity of the seismic isolation device 14, and the vertical load of the bridge girder 12 is transmitted to the pier 10 via the support, and the vertical load does not act on the seismic isolation device 14 and only the horizontal load is applied. Works.

  The seismic isolation device 14 includes an upper collar 20, a rubber bearing 30, and a base plate 40.

  The base plate 40 is made of a rectangular steel plate and is fixed on the pier 10 by a plurality of anchor bolts 16.

  The rubber support 30 is rectangular and surrounds a plurality of metal plates 32A stacked with a predetermined gap in the thickness direction, a rubber layer 32B disposed in these gaps, and an edge of the metal plate 32A. A rubber wall 32 </ b> C disposed in the periphery. In the state where the metal plates 32A and the rubber layers 32B are alternately stacked, the lower connection plate 33 and the upper connection plate 31 are fixed to both end surfaces (lower surface and upper surface) in the stacking direction, respectively. The lower connecting plate 33 is formed of a rectangular steel plate having an upper area that is substantially the same size as the metal plate 32A and is thicker than the metal plate 32A. The upper connecting plate 31 is made of a rectangular steel plate that is larger in size than the metal plate 32A and has an outer periphery that is thicker than the metal plate 32A. The outer sides of the lower connecting plate 33 and the upper connecting plate 31 are covered with a rubber wall 32C.

  The upper gutter 20 is fixed to the lower side of the bridge girder 12 with anchor bolts 17. The rubber bearing 30 is disposed between the upper collar 20 and the base plate 40.

  The lower connecting plate 33 of the rubber support 30 is fixed on the base plate 40 with anchor bolts 16. The upper connecting plate 31 is disposed at a predetermined distance from the lower surface of the upper flange 20, and is fixed to the upper flange 20 with bolts 22 from below the overhanging flange portion. A gap S is formed by being separated by the predetermined distance.

  The lower connecting plate 33 may be fixed with the base plate 40 and the fixing bolt 40B as shown in FIG. 8 without being fixed with the anchor bolt 16.

  A circular concave upper key hole 24 is formed at the center of the lower surface of the upper collar 20, and a slightly smaller diameter than the upper key hole 24 at a position corresponding to the upper key hole 24 on the upper surface of the upper connecting plate 31. A lower key hole 34 is formed. A shear key 26 is fitted in the upper key hole 24 and the lower key hole 34.

  As shown in FIG. 2A, the shear key 26 has a substantially cylindrical shape and is spaced apart from the bottom surface of the upper key hole 24. A gap D is formed between the bottom of the upper key hole 24 and the upper surface of the shear key 26. The shear key 26 is provided with a protrusion 27 on the portion fitted into the upper key hole 24, that is, on the outer peripheral upper portion of the shear key 26. The protrusion 27 has an arcuate (R-shaped) outer peripheral side in the side cross section, and is configured over one circumference in the circumferential direction of the shear key 26 as shown in FIG.

  A key side contact member 28 made of stainless steel is attached to the outside of the protrusion 27. The key side contact member 28 has an arc shape (R shape) so as to cover the outer side of the protrusion 27. The key-side contact member 28 can be attached to the shear key 26 by welding or screwing.

  A hole-side contact member 25 is attached to a side inner wall constituting the upper key hole 24 of the upper collar 20, that is, a position facing the key-side contact member 28. The hole-side contact member 25 has a strip shape and is made of stainless steel. The hole side contact member 25 can also be attached to the upper collar 20 by welding or screwing.

  The upper collar 20 and the shear key 26 are slidably contacted via the key side contact member 28 and the hole side contact member 25.

  A rubber material 42 is provided outside the shear key 26 in the gap S between the upper collar 20 and the upper connecting plate 31 so as to fill the gap S. Further, as shown in FIG. 1, a rubber material 44 is provided in a portion inside the gap S from the bolt 22 so as to fill the gap S. The rubber material 42 and the rubber material 44 are not always necessary.

  Next, the effect | action of the seismic isolation apparatus 14 of this embodiment is demonstrated. In the seismic isolation device 14 of the present embodiment configured as described above, when the bridge pier 10 and the bridge girder 12 move relative to each other in the horizontal direction, the horizontal shift acts on the rubber bearing 30 via the shear key 26, and the rubber bearing A horizontal load is received by 30 shear deformation.

  On the other hand, when the bridge girder 12 swings including a vertical component, the upper gutter 20 swings similarly. At this time, the shear key 26 and the upper collar 20 are rotated relative to each other by the sliding contact between the key side contact member 28 and the hole side contact member 25. This is because a gap D is formed between the shear key 26 and the upper rod 20, a gap S is formed between the upper connecting plate 31 and the upper rod 20, and the sliding contact portion has an R shape. It is because. Thus, since the key side contact member 28 and the hole side contact member 25 made of stainless steel are in sliding contact with each other even when the shear key 26 and the upper collar 20 are relatively rotated, the sliding contact is made. Therefore, the seismic isolation device 14 is smoothly operated. Further, since the shear key 26 and the entire upper collar 20 are not made of stainless steel, the seismic isolation device can be manufactured at low cost.

  In the present embodiment, the protrusion 27 is formed on the shear key 26. However, as shown in FIG. 3, a key-side contact member 29 having a semicircular cross section is provided on the outer periphery of the shear key 26 over one circumference in the circumferential direction. It is also possible to fix the sliding contact portion in an R shape.

  In the present embodiment, an example in which the key side contact members 28 and 29 are formed in an R shape has been described. However, the hole side contact member may be formed in an R shape, and may be a hole side contact member 25A as illustrated in FIG. In this case, the key-side contact member 28A does not need to have an R shape.

  In the present embodiment, the configuration in which the relative rotation is performed between the shear key 26 and the upper collar 20 has been described. However, the relative rotation between the shear key 26 and the upper connecting plate 31 is performed. May be. In this case, as shown in FIG. 5, the lower surface of the shear key 26 and the upper connecting plate 31 are separated from each other to form a gap S <b> 2, and a protrusion 26 </ b> A is formed at the center of the lower surface of the shear key 26. It is brought into contact with the connecting plate 31. The hole-side contact member 25 is attached to the inner wall of the lower key hole 34, and a protrusion 27 is formed on the outer peripheral lower portion of the shear key 26, and the outer side thereof is covered with the key-side contact member 28 (see FIG. 5A). ), Or by attaching a key-side contact member 29 to the lower part of the outer periphery of the shear key 26 (see FIG. 5B), the sliding contact portion is formed in an R shape.

  When the hole-side contact member has an R shape, the hole-side contact member 25A may be attached to the inner wall of the lower key hole 34 as shown in FIG.

  In this embodiment, an example in which the shear key 26 has a substantially cylindrical shape has been described. However, the present invention can also be applied to a case where the shear key has a prismatic shape. In this case, as shown in FIG. 7A, a protrusion 27-2 is formed on the upper part of the prismatic shear key 26-2, and the upper key hole 24-2 is made to correspond to the shear key 26-2. The lower keyhole (not shown) is also formed in a prismatic shape. And the key side contact member 28-2 comprised with stainless steel is attached so that the outer side of the protrusion 27-2 of the shear key 26-2 may be covered, and the hole side contact member 25-2 is attached to the upper key hole 24-2. What is necessary is just to arrange | position inside. Further, as shown in FIG. 7B, the protrusion 27-2 is not formed, and the key-side contact member 29-2 having a semicircular cross section is fixed to the outer periphery of the shear key 26-2, and the sliding contact portion Can also be rounded.

It is a sectional side view of the seismic isolation apparatus of embodiment of this invention. It is (A) sectional side view which shows the shear key vicinity of the seismic isolation apparatus of embodiment of this invention, (B) is sectional drawing of X1-X1 of (A). It is the (A) sectional side view which shows the shear key vicinity of the modification of the seismic isolation apparatus of embodiment of this invention, (B) is sectional drawing of X2-X2 of (A). It is a sectional side view which shows the shear key vicinity of the other modification of the seismic isolation apparatus of embodiment of this invention. It is a sectional side view which shows the shear key vicinity of the other modification of the seismic isolation apparatus of embodiment of this invention. It is a sectional side view which shows the shear key vicinity of the other modification of the seismic isolation apparatus of embodiment of this invention. It is sectional drawing of the horizontal direction which shows the modification of the shear key of the seismic isolation apparatus of embodiment of this invention. It is a figure which shows the modification of the attachment to the pier of the seismic isolation apparatus of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bridge pier 12 Bridge girder 14 Seismic isolation device 20 Upper arm 24 Upper key hole 25 Hole side contact member 25A Hole side contact member 26 Shear key 27 Rib 28 Key side contact member 28A Key side contact member 29 Key side contact member 30 Rubber bearing 31 Upper connecting plate 33 Lower connecting plate 34 Lower key hole

Claims (4)

A seismic isolation device installed between a supporting member and a supported member and supporting a horizontal load,
An upper collar fixed to the lower side of the supported member and having an upper keyhole on the lower surface side;
An upper connecting plate having a lower key hole formed at a position facing the upper key hole on the upper surface side and spaced apart from the upper collar, a lower connecting plate fixed on the upper side of the support member, and the upper portion A rubber bearing having a rubber portion disposed between the connecting plate and the lower connecting plate;
A shear key fitted into the upper keyhole and the lower keyhole, allowing relative rotation between the upper collar and the upper coupling plate, and coupling the upper collar and the upper coupling plate;
A hole-side contact member that is attached to a sliding contact portion that is in sliding contact with the shear key of the upper collar and the upper connecting plate, and is made of stainless steel,
A key-side contact member that is attached to a position facing the hole-side contact member of the shear key and is made of stainless steel;
With
One of the hole side contact member or the key side contact member has an arc shape in which a contact surface with the other protrudes toward the other side.   At least one of an upper part and a lower part of the side circumferential surface of the shear key is configured with an arc-shaped protrusion projecting toward the hole-side contact member side in the circumferential direction, and the key-side contact member extends along the protrusion. The seismic isolation device according to claim 1, wherein the seismic isolation device is disposed so as to cover the protrusion.   The seismic isolation according to claim 1, wherein the key-side contact member has a semicircular side cross-section, and a side-section linear side of the key-side contact member is attached to a side end surface of the shear key. apparatus.   2. The seismic isolation device according to claim 1, wherein the hole-side contact member has a semicircular side cross-section, and a side-section straight line side of the hole-side contact member is attached to the sliding contact portion.

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