JP2009144429A - Sliding bearing for structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding bearing for a structure, effectively utilizing large vibration energy based on a strong earthquake, thereby preventing an upper structure from slipping off from a lower structure, having no risk of a collapse and achieving reduction in manufacturing cost and fully occupying space. <P>SOLUTION: This sliding bering 1 for a bridge is interposed between a bridge pier 2 and a bridge girder 3 to support the bridge girder 3 to the bridge pier 2 to freely move in the bridge axial direction H in the horizontal direction. The sliding bearing 1 includes: a sliding plate 8 fixed at its top face to the lower surface 6 of the bridge girder 3 through a fitting plate 7 fixed to the lower surface 6 of the bridge girder 3 and having an upper sliding surface 5 on the lower surface; a sliding plate 10, which comes into contact with the upper sliding surface 5 to freely slide in the H direction and has a lower sliding surface 9 bearing the vertical load of the bridge girder 3 through the upper sliding surface 5, the sliding plate 8 and the fitting plate 7 on the upper surface; and a restoring force generating means 11, which generates restoring force to the relative displacement in the H direction more than fixed of the bridge girder 3 to the bridge pier 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is for a structure which is interposed between a lower structure such as a foundation and a bridge pier and an upper structure such as a building and a bridge girder and supports the upper structure so as to be movable in a horizontal direction with respect to the lower structure. Regarding sliding bearings.

JP-A-10-73145 JP-A-11-81237

  The sliding bearing prevents the collapse of the upper structure due to an earthquake or the like without transmitting the vibration of the ground due to the earthquake or the like to the upper structure such as a building or a bridge girder. In addition to the above, the sliding bearing used for the bridge absorbs the expansion and contraction of the bridge girder due to the temperature change by the sliding.

  By the way, if the upper structure is largely displaced with respect to the lower structure due to a large earthquake or the like, the sliding structure using simply sliding between flat surfaces may cause the upper structure to fall from the lower structure. Even if a drop-off prevention mechanism is provided to prevent such drop-off, large vibration energy based on a large earthquake or the like is directly applied to the drop-off prevention mechanism, and the drop-off prevention mechanism may be damaged. Further, the drop-off prevention mechanism for large vibration energy is not always satisfactory because it is expensive to manufacture and requires a large space.

  The present invention has been made in view of the above points, and its object is to effectively absorb large vibration energy by converting vibration energy, which is large kinetic energy based on a large earthquake, etc., into potential energy. Thus, it is possible to provide a sliding bearing for a structure that can prevent the upper structure from falling off from the lower structure and that can be prevented from being damaged and that can reduce the manufacturing cost and the occupied space. There is.

  The sliding bearing for the structure according to the present invention interposed between the lower structure and the upper structure to support the upper structure movably in the horizontal direction with respect to the lower structure is provided on the upper structure side. An upper side sliding surface arranged and a lower part arranged on the lower structure side so as to be in sliding contact with the upper side sliding surface in a horizontal direction and to receive the load of the upper structure through the upper side sliding surface A side sliding surface and restoring force generating means for generating restoring force with respect to a relative displacement in a horizontal direction of the upper structure with respect to the lower structure. The restoring force generating means includes the lower structure and the upper part. It has a displacement surface that is fixed to one of the structures and extends in a direction intersecting the lower sliding surface, and a facing surface that faces the displacement surface, and is above a certain level of the upper structure relative to the lower structure. Displacement in the horizontal relative displacement of Based on the opposing surface contacts to and is adapted to move the upper structure from the superstructure in the vertical direction.

  According to the present invention, the restoring force generating means having the displacement surface extending in the crossing direction with respect to the lower side sliding surface and the opposing surface facing the displacement surface is more than a certain level of the upper structure relative to the lower structure. Since the upper structure is moved vertically from the lower structure based on the contact of the opposing surface with the displacement surface in the relative displacement in the horizontal direction, vibration that is large kinetic energy due to large earthquakes, etc. Energy can be converted into potential energy with vertical movement of the upper structure from the lower structure to effectively absorb large vibration energy, and between the upper structure and the lower structure based on such large vibration energy. It can prevent relative large horizontal displacement, and can prevent the fall of the upper structure from the lower structure, and can effectively use the large vibration energy based on a big earthquake etc. On that may eliminate the risk of damage, in order to obtain achieving reduction of reduction and space occupied by the manufacturing cost, the damping effect can be expected due to frictional force at the contact of the opposing surfaces of the displacement surfaces.

  In a preferred example of the present invention, each of the upper side sliding surface and the lower side sliding surface has a flat surface extending in the horizontal direction, and each of the displacement surface and the opposing surface is the upper side sliding surface and the lower side sliding surface. It has a flat surface inclined with respect to.

  In another preferred example, each of the upper side sliding surface and the lower side sliding surface has a flat surface extending in the horizontal direction, and each of the displacement surface and the opposing surface has a curved surface, The displacement surface has a curved concave surface, and the opposing surface may have a curved convex surface. Alternatively, the displacement surface may have a curved convex surface, and the opposing surface may have a curved concave surface. Good.

  In another preferable example, each of the upper side sliding surface and the lower side sliding surface has a flat surface extending in the horizontal direction, and the displacement surface has one of a curved surface and a flat surface. The displacement surface has the other of a curved surface and a flat surface.

  The displacement surface extends continuously with one of the upper side sliding surface and the lower side sliding surface, and the opposing surface may extend continuously with the other of the upper side sliding surface and the lower side sliding surface. Alternatively, the displacement surface and the opposing surface may be provided separately from the upper side sliding surface and the lower side sliding surface, and one of the displacement surface and the opposing surface may be the upper side. It extends continuously with one of the sliding surface and the lower sliding surface, and the other of the displacement surface and the opposing surface is provided independently of the other of the upper sliding surface and the lower sliding surface. It may be done.

  In the present invention, the restoring force generating means may include a prohibiting mechanism that prohibits a relative horizontal displacement of the upper side sliding surface with respect to the lower side sliding surface beyond a certain level in addition to the displacement surface and the opposing surface. .

  In the above, by appropriately setting the inclination angle, shape, curvature, etc. of the inclined flat surface, the curved convex surface and the curved concave surface, the conversion characteristics from kinetic energy to potential energy and / or plasticization of the substructure can be arbitrarily controlled. can do.

  In the present invention, even if the mechanism for receiving the load of the upper structure composed of the upper side sliding surface and the lower side sliding surface and the restoring force generating means are integrally provided, the mechanism for receiving the load and the restoring force are replaced by this. The generating means may be provided separately, and when provided separately, the degree of freedom in seismic design is increased, which may be preferable.

  According to the present invention, vibration energy, which is large kinetic energy based on a large earthquake or the like, can be converted into potential energy to effectively absorb large vibration energy, thus preventing the upper structure from falling off from the lower structure. In addition, it is possible to provide a sliding bearing for a structure that can reduce the manufacturing cost and the occupied space without causing the possibility of damage.

  Next, an example of an embodiment of the present invention will be described in more detail based on an example shown in the figure. The present invention is not limited to these examples.

  In FIG. 1, a sliding support 1 for a bridge as a structure of this example includes a bridge girder 3 as an upper structure in a horizontal direction with respect to a bridge pier 2 as a lower structure in a bridge axis direction H (hereinafter, H direction). It is interposed between the bridge pier 2 and the bridge girder 3 so as to be movably supported.

  The sliding support 1 has an upper surface fixed to the lower surface 6 of the bridge girder 3 via a mounting plate 7 fixed to the lower surface 6 of the bridge girder 3 via bolts and the like, and has an upper side sliding surface 5 on the lower surface. The sliding plate 8 and the upper sliding surface 5 are slidably contacted in the H direction, and the vertical direction V (hereinafter referred to as V direction) of the bridge girder 3 through the upper sliding surface 5, the sliding plate 8 and the mounting plate 7. ) And a restoring force generating means 11 for generating a restoring force with respect to the relative displacement in the H direction of the bridge girder 3 with respect to the bridge pier 2 over a certain level. ing.

  The restoring force generating means 11 includes a base 24 fixed to the upper surface 22 of the pier 2 with anchor bolts and nuts 23 at the flange portion 21, and a sliding plate support mechanism 25 provided at the upper end in the V direction of the base 24. And a pair of displacement mechanisms 26 and 27 provided on both side surfaces in the H direction of the base 24 and the lower surface 6 of the bridge girder 3 via the mounting plate 7, and the base 24 in the H direction. And a pair of support members 28 and 29, and sliding plates 32 and 33 fixed to the inclined surfaces 30 and 31 of the support members 28 and 29 inclined with respect to the H direction, respectively.

  The base 24 has a flat upper end surface 35 extending in the H direction and a pair of flat inclined surfaces 36 and 37 extending downward from the both end edges of the upper end surface 35 in the H direction. The base main body 38 which consists of a truncated quadrangular pyramid, and the collar part 21 integrally provided in the flat lower end surface 39 extended in the H direction of the base main body 38 are comprised.

  The sliding plate support mechanism 25 includes a recess 41 formed in the upper end surface 35 of the base body 38, and natural rubber or synthetic rubber disposed in the recess 41 and vulcanized or bonded to the base body 38. And the lower surface 44 of the sliding plate 10 is vulcanized and bonded to the upper surface 43 of the elastic plate 42, so that the sliding plate support mechanism 25 is connected to the elastic plate 42. The sliding plate 10 is supported on the base main body 38 via. The sliding plate 10 may be disposed on the upper surface 43 of the elastic plate 42 and fitted to the base body 38 in the recess 41 instead of being vulcanized and bonded to the upper surface 43 of the elastic plate 42 at the lower surface 44. .

  The displacement mechanism 26 includes a recess 51 formed in the inclined surface 36 of the base body 38 that is one side surface of the base 24 in the H direction, and is disposed in the recess 51 and vulcanized or bonded to the base body 38. The elastic plate 52 for shock absorption made of fitted natural rubber or synthetic rubber, and the upper side sliding surface 5 and the lower side extending in the H direction as a displacement surface extending in the crossing direction with respect to the lower side sliding surface 9 And a sliding plate 54 that has an inclined surface 53 that is a flat surface inclined with respect to the sliding surface 9 and is vulcanized and bonded to the elastic plate 52 on the back surface of the inclined surface 53. The sliding plate 54 may be overlapped with the elastic plate 52 and fitted to the base body 38 at the recess 51 instead of being vulcanized and bonded to the elastic plate 52 on the back surface.

  Similarly to the displacement mechanism 26, the displacement mechanism 27 includes a recess 56 formed in the inclined surface 37 of the base body 38 that is the other side surface in the H direction of the base 24, and a base that is disposed in the recess 56. An elastic plate 57 for impact absorption made of natural rubber or synthetic rubber or the like vulcanized or bonded to the main body 38, and an upper portion extending in the H direction as a displacement surface extending in a crossing direction with respect to the lower side sliding surface 9. And a sliding plate 59 which has an inclined surface 58 formed of a flat surface inclined with respect to the side sliding surface 5 and the lower side sliding surface 9 and is vulcanized and bonded to the elastic plate 57 on the back surface with respect to the inclined surface 58. . The sliding plate 59 may be overlapped with the elastic plate 57 and fitted to the base body 38 in the recess 56 instead of being vulcanized and bonded to the elastic plate 57 on the back surface.

  The support member 28 that obliquely protrudes from the lower surface 6 of the bridge girder 3 toward the sliding plate 54 is fixed to the mounting plate 7 by a bolt 61 or the like at one end thereof with a bolt or the like, and the lower surface of the bridge girder 3 via the mounting plate 7. 6 is fixed.

  The supporting member 29 that protrudes obliquely from the lower surface 6 of the bridge girder 3 toward the sliding plate 59 is fixed to the mounting plate 7 with a bolt 62 or the like at one end of the supporting member 29, and the lower surface of the bridge girder 3 via the mounting plate 7. 6 is fixed.

  The sliding plate 32 having the sliding surface 66 formed of an inclined flat surface facing the inclined surface 53 with a gap 65 is the back surface of the sliding surface 66 and the inclined surface 30 of the flange 67 at the other end of the support member 28. The inclined surface 53 as the displacement surface and the sliding surface 66 as the opposing surface have the same inclination angle (complementary angle relationship).

  The sliding plate 33 having the sliding surface 69 formed of an inclined flat surface facing the inclined surface 58 with a gap 68 is an inclined surface 31 of the flange portion 70 at the other end of the support member 29 on the back surface with respect to the sliding surface 69. The inclined surface 58 as the displacement surface and the sliding surface 69 as the opposing surface have the same inclination angle (complementary angle relationship), and the inclined surface 53 and the sliding surface 66. Both have the same inclination angle.

  A slide having an upper sliding surface 5 arranged on the bridge girder 3 side and a sliding plate 8 fixed to the mounting plate 7 via bolts or the like and a lower sliding surface 9 arranged on the bridge pier 2 side Each of the plates 10 is made of a synthetic resin having a low friction characteristic such as a polytetrafluoroethylene resin or a synthetic resin containing a reinforcing material in which a reinforcing material such as glass fiber and organic fiber is mixed into the synthetic resin.

  Similarly to the sliding plates 8 and 10, the sliding plates 32 and 33 are also reinforced by mixing a synthetic resin having a low friction characteristic such as polytetrafluoroethylene resin or a reinforcing material such as glass fiber and organic fiber into the synthetic resin. It may be made of a synthetic resin containing material, and when a damping effect due to frictional force is expected, it may be made of, for example, a braking material having high friction characteristics.

  For example, as shown in FIG. 2, the above-mentioned sliding bearing 1 causes vibrations or displacements in one direction in the H direction of the bridge girder 3 relative to the bridge pier 2 based on expansion and contraction of the bridge girder 3 due to a small earthquake or temperature change to the lower side sliding surface 9. The upper side sliding surface 5 is allowed to slide in the H direction, and similarly, the vibration or displacement in the other direction in the H direction of the bridge girder 3 with respect to the bridge pier 2 based on the expansion and contraction of the bridge girder 3 due to a small earthquake or temperature change, etc. The upper side sliding surface 5 with respect to the surface 9 is allowed to slide in the H direction, and thus the transmission of the vibration in the H direction of the pier 2 due to a small earthquake or the like to the bridge girder 3 is prevented, and the bridge girder 3 in a small earthquake or the like. In the expansion and contraction of the bridge girder 3 due to the temperature change, the excessive load in the H direction is prevented from being generated, and the transmission of the displacement of the bridge girder 3 in the H direction due to the temperature change to the pier 2 is prevented. Settings to avoid an excessive load of H direction to the leg 2 and a flexural oscillation in the V direction of the bridge girder 3 permits the elastic stretch of the elastic plate 42 by the running of an automobile.

  In a large earthquake, for example, as shown in FIG. 3, when relative vibration displacement in one direction in the H direction of a certain level or more occurs in the bridge girder 3 with respect to the pier 2, the sliding bearing 1 has the sliding surface 66, the inclined surface 53, and the like. And a slip between the sliding surface 66 and the inclined surface 53 to raise the bridge girder 3 and move the bridge girder 3 in the V direction from the pier 2 to move the upper side sliding surface 5. Is released from contact with the lower sliding surface 9, and after such movement and release, the bridge girder 3 passes through the sliding between the sliding surface 66 and the inclined surface 53 with relative vibration displacement in the other direction in the H direction. Is released, the separation of the upper side sliding surface 5 from the lower side sliding surface 9 in the V direction is released, and the contact of the upper side sliding surface 5 with the lower side sliding surface 9 is recovered. For a large relative vibration displacement in the direction of, the sliding surface 69 and the inclined surface 5 Thereafter, the sliding surface 66 and the inclined surface 53 are operated in the same manner as in the case of the mutual contact between the sliding surface 66 and the inclined surface 53. In addition, the vibration energy, which is a large kinetic energy based on a large earthquake that causes the bridge girder 3 to have a relative displacement in the H direction beyond a certain level with respect to the pier 2, is converted into the positional energy of the bridge girder 3. Thus, excessive displacement of the bridge girder 3 in the H direction with respect to the pier 2 is prevented.

  In order to support the bridge girder 3 so as to be movable in the H direction with respect to the pier 2, a sliding support 1 for the bridge interposed between the pier 2 and the bridge girder 3, and an upper side slip arranged on the bridge girder 3 side A lower sliding surface 9 disposed on the pier 2 side so as to be slidably contacted in the H direction with the surface 5 and to receive the load of the bridge girder 3 via the upper sliding surface 5; And a restoring force generating means 11 for generating a restoring force with respect to a relative displacement in the H direction of the bridge girder 3 with respect to the pier 2 over a certain level. The restoring force generating means 11 is fixed to the pier 2 via the base 24. And inclined surfaces 53 and 58 as displacement surfaces extending in a direction intersecting with the lower sliding surface 9 and sliding surfaces 66 and 69 as opposing surfaces facing the inclined surfaces 53 and 58, respectively. In the relative displacement in the H direction of bridge girder 3 with respect to pier 2 According to the above sliding bearing 1 which moves the bridge girder 3 in the vertical direction from the pier 2 based on the contact of the sliding surfaces 66 and 69 with the inclined surfaces 53 and 58, the large vibration caused by a large earthquake or the like. The energy can be converted into the position energy in the V direction from the pier 2 of the bridge girder 3 to absorb the vibration energy, and the relative large displacement in the H direction between the bridge girder 3 and the pier 2 based on such large vibration energy is prevented. Thus, the bridge girder 3 can be prevented from falling off from the bridge pier 2, and a large vibration energy based on a large earthquake can be effectively used to eliminate the risk of breakage. In addition, a damping effect due to frictional force can be expected in the contact of the sliding surfaces 66 and 69 with the inclined surfaces 53 and 58, and by appropriately setting the inclination angles of the inclined surfaces 53 and 58, It can be arbitrarily controlled plastic of conversion characteristics and pier 2 to the potential energy of the dynamic energy.

  The above-described sliding bearing 1 uses a flat surface made of inclined surfaces 53 and 58 inclined as a displacement surface, and uses a flat surface made of inclined surfaces 66 and 69 inclined as an opposing surface, as shown in FIG. Alternatively, a curved surface composed of the curved convex surfaces 71 and 72 may be used as the displacement surface, and a curved surface composed of the curved concave surfaces 73 and 74 may be used as the opposing surface.

  That is, in order to support the bridge girder 3 movably in the H direction with respect to the pier 2, the bridge support 1 for the bridge shown in FIG. 4 interposed between the pier 2 and the bridge girder 3 is connected to the bridge girder via bolts or the like. A sliding member 77 having an upper surface 75 fixed to the lower surface 6 of the bridge girder 3 and an upper side sliding surface 76 on the lower surface 99 via an attachment plate 7 fixed to the lower surface 6 of the upper surface 3; A sliding plate having a lower side sliding surface 78 on its upper surface that is slidably contacted with the surface 76 in the H direction and receives a load in the V direction of the bridge girder 3 via the upper side sliding surface 76, the sliding member 77 and the mounting plate 7. 79 and a restoring force generating means 80 for generating a restoring force for the relative displacement in the H direction of the bridge girder 3 with respect to the bridge pier 2 in a certain direction or more.

  The sliding plate 79 is formed integrally with a back metal 85 and one surface 86 of the back metal 85 and has a low friction characteristic such as polytetrafluoroethylene resin, or a glass fiber and an organic fiber in such a synthetic resin. And a sliding layer 87 made of a synthetic resin containing a reinforcing material mixed with a reinforcing material such as the like. The exposed surface of the upper surface of the sliding layer 87 is a lower side sliding surface 78.

  The restoring force generating means 80 is provided on a base 90 fixed to the upper surface 22 of the pier 2 via anchor bolts / nuts 23 (see FIG. 1) and the like, and a flat upper end surface 91 in the V direction of the base 90. The sliding plate support mechanism 92, a pair of displacement mechanisms 95 and 96 having curved convex surfaces 71 and 72 provided on both side surfaces 93 and 94 in the H direction of the base 90, and the H of the upper side sliding surface 76 Curved concave surfaces 73 and 74 are formed on the lower surface 99 of the sliding member 77 so as to extend continuously from the respective end edges 97 and 98 in the direction.

  The sliding plate support mechanism 92 includes a recess 101 formed in the upper end surface 91 of the base 90 and an elastic plate 102 made of shock absorbing natural rubber or synthetic rubber or the like disposed in the recess 101. The sliding plate 79 contacts the upper surface 103 of the elastic plate 102 on the back surface 104 thereof and is disposed on the base 90 in the recess 101, whereby the sliding plate support mechanism 92 is interposed via the elastic plate 102. A sliding plate 79 is supported on the base 90. The elastic plate 102 may be vulcanized and bonded to the sliding plate 79 and the base 90.

  The curved concave surface 73 faces the curved convex surface 71 fixed to the pier 2 via the base 90 with a gap 105, and the curved concave surface 74 having the same radius of curvature as the curved concave surface 73 is a curved convex surface. The curved convex surface 72 that has the same radius of curvature as 71 and faces the curved convex surface 72 fixed to the bridge pier 2 via the base 90 with a gap 106, and the curved concave surfaces 73 and 74 are curved convex surfaces. It has a radius of curvature larger than the radius of curvature of each of 71 and 72.

  Also in the sliding bearing 1 shown in FIG. 4 described above, the vibration in the H direction of the bridge girder 3 with respect to the pier 2 based on the expansion and contraction of the bridge girder 3 due to a small earthquake or temperature change is caused in the H direction of the upper sliding surface 76 with respect to the lower sliding surface 78. Allowing by slipping, preventing transmission of vibration in the H direction of the pier 2 due to a small earthquake to the bridge girder 3, so that an excessive load in the H direction is not generated on the bridge girder 3 in a small earthquake, and the bridge girder due to temperature change The transmission of the displacement in the H direction of the bridge girder 3 based on the expansion and contraction of the bridge 3 to the bridge pier 2 is prevented so that an excessive load in the H direction is not generated on the bridge pier 2 in the expansion and contraction of the bridge girder 3 The bending vibration of the bridge girder 3 in the V direction due to the above is allowed by elastic expansion and contraction of the elastic plate 102.

  When a relative vibration displacement in one direction in the H direction, for example, above a certain level, occurs in the bridge girder 3 with respect to the pier 2 in a large earthquake or the like, the sliding bearing 1 has a curved convex surface 72 and a curved concave surface 74 as shown in FIG. And a sliding between the curved convex surface 72 and the curved concave surface 74 to raise the bridge girder 3 and to move the bridge girder 3 in the vertical direction from the pier 2 to move the upper side sliding surface. 76 is released from contact with the lower sliding surface 78, and after such movement and release, the bridge girder is slipped between the curved convex surface 72 and the curved concave surface 74 with relative vibration displacement in the other direction in the H direction. 3 is released, the separation of the upper side sliding surface 76 from the lower side sliding surface 78 in the V direction is released, and the contact of the upper side sliding surface 76 with the lower side sliding surface 78 is recovered. Large relative vibration variation in the other direction Then, the curved convex surface 71 and the curved concave surface 73 are brought into mutual contact, and thereafter, the same operation as in the case of mutual contact between the curved convex surface 72 and the curved concave surface 74 is performed. In the mutual contact of the concave surface 74 and the mutual contact of the curved convex surface 71 and the curved concave surface 73, a large kinetic energy based on a large earthquake or the like causing a relative displacement in the H direction to a certain level or more in the bridge girder 3 with respect to the pier 2 is applied to the bridge girder 3. Thus, the relative displacement in the H direction of the bridge girder 3 with respect to the pier 2 is not caused.

  In order to support the bridge girder 3 so as to be movable in the H direction with respect to the pier 2, a sliding support 1 for the bridge interposed between the pier 2 and the bridge girder 3, and an upper side slip arranged on the bridge girder 3 side A lower side sliding surface 78 disposed on the pier 2 side so as to be in sliding contact with the upper side sliding surface 76 in the H direction and receive the load of the bridge girder 3 via the upper side sliding surface 76, Restoring force generating means 80 for generating a restoring force with respect to the relative displacement in the H direction of the bridge girder 3 with respect to the bridge pier 2 above a certain level. The restoring force generating means 80 is fixed to the pier 2 via the base 90. And curved convex surfaces 71 and 72 as displacement surfaces extending in the crossing direction with respect to the lower sliding surface 78, and curved concave surfaces 73 and 74 as opposing surfaces facing the curved convex surfaces 71 and 72, respectively. H, more than a certain amount of bridge girder 3 to pier 2 The above-mentioned sliding bearing 1 is adapted to move the bridge girder 3 in the vertical direction from the pier 2 based on the contact of the curved concave surfaces 73 and 74 with the curved convex surfaces 71 and 72 in a relative displacement of The large vibration energy based on the bridge girder 3 can be converted into the position energy in the V direction from the pier 2 of the bridge girder 3 to absorb the kinetic energy, and the relative H direction trouble between the bridge girder 3 and the pier 2 based on the large vibration energy can be absorbed. The position of the bridge girder 3 can be prevented from falling off from the pier 2 and the large vibration energy based on a large earthquake can be used effectively, eliminating the risk of damage and cost for manufacturing. In addition, the occupied space can be reduced.

  In the restoring force generating means 11 of the sliding bearing 1 shown in FIG. 1, a pair of displacement mechanisms 26 and 27 having inclined surfaces 53 and 58 that are inclined flat surfaces serving as displacement surfaces are inclined in both directions in the H direction of the base body 38. Sliding plates 32 and 33 provided on the surfaces 36 and 37 and having sliding surfaces 66 and 69 made of inclined flat surfaces as opposing surfaces are fixed to the inclined surfaces 30 and 31 of the support members 28 and 29, respectively. Instead, as shown in FIGS. 6 and 7, a pair of displacement mechanisms 26 and 27 having inclined surfaces 53 and 58 each having an inclined flat surface as a displacement surface are provided independently of the base body 38. Sliding surfaces 66 and 69 made of inclined flat surfaces as opposing surfaces may be provided on the sliding plate 8 together with the upper side sliding surface 5.

  In the sliding bearing 1 shown in FIGS. 6 and 7, the displacement mechanisms 26 and 27 are fixed to the flange portion 21 with the columnar base body 38 sandwiched in the direction orthogonal to the H direction and are commonly used for each. Triangular projecting members 111 and 112 are provided, and each of the projecting members 111 and 112 is composed of an inclined surface 53 that is an inclined flat surface as a displacement surface and an inclined flat surface that is also the other displacement surface. And two sliding surfaces comprising two inclined surfaces 53 which are fixed to the pier 2 via the flange 21 with two gaps 65 and which are inclined flat surfaces as opposing surfaces. 66 is provided at one end side in the H direction of the sliding plate 8 and at both end edges in the direction orthogonal to the H direction, and two two inclined surfaces 58 fixed to the bridge pier 2 via the flange 21 are provided. Pair with gap 68 In addition, the two sliding surfaces 69, which are inclined flat surfaces as opposing surfaces, are provided at both ends of the sliding plate 8 at the other end side in the H direction and perpendicular to the H direction, The sliding plate 10 having the surface 9 on the upper surface and the elastic plate 42 for shock absorption have a disk shape.

  Also in the sliding bearing 1 shown in FIGS. 6 and 7, the vibration of the bridge girder 3 in the H direction with respect to the pier 2 based on the expansion and contraction of the bridge girder 3 due to a small earthquake or a temperature change is applied to the H of the upper sliding surface 5 with respect to the lower sliding surface 9. Allowed by slipping in the direction, preventing transmission of vibration in the H direction of the pier 2 due to a small earthquake to the bridge girder 3, so that an excessive load in the H direction is not generated on the bridge girder 3 in the earthquake, due to temperature change The transmission of vibration in the H direction of the bridge girder 3 based on the expansion and contraction of the bridge girder 3 to the pier 2 is prevented, so that an excessive load in the H direction is not generated on the pier 2 in the expansion and contraction of the bridge girder 3 and The flexural vibration of the bridge girder 3 in the V direction due to traveling or the like is allowed by elastic expansion and contraction of the elastic plate 42, and relative vibration displacement in one direction in the H direction above a certain level on the bridge girder 2 with respect to the pier 2 in a large earthquake or the like. Occurs For example, the two sliding surfaces 66 and the two inclined surfaces 53 are brought into mutual contact and, after such contact, sliding is caused between the sliding surface 66 and the inclined surface 53 to raise the bridge girder 3, thereby 2 to the V direction to release the contact of the upper side sliding surface 5 with the lower side sliding surface 9, and after such movement and release, relative sliding displacement in the other direction in the H direction, The bridge girder 3 is lowered through sliding with the inclined surface 53 to release the V-direction separation from the lower sliding surface 9 of the upper sliding surface 5 to the lower sliding surface 9 of the upper sliding surface 5. Next, a large relative vibration displacement in the other direction in the H direction causes mutual contact between the two sliding surfaces 69 and the two inclined surfaces 58. It operates in the same way as in the case of mutual contact with the inclined surface 53. In the mutual contact between the two sliding surfaces 66 and the inclined surface 53 and the mutual contact between the two sliding surfaces 69 and the inclined surface 58, a large vibration that causes a relative displacement in the H direction to a certain degree or more in the bridge girder 3 with respect to the pier 2. The energy is converted into the potential energy of the bridge girder 3 so as not to cause excessive displacement of the bridge girder 3 in the H direction with respect to the pier 2.

  In the sliding bearing 1 shown in FIG. 6 and FIG. 7, the displacement provided with the substantially triangular projecting members 111 and 112 respectively fixed to the flange portion 21 with the base body 38 sandwiched in the direction orthogonal to the H direction. Although the mechanisms 26 and 27 are used, instead of this, as shown in FIGS. 8 and 9, the common base material sandwiched in the direction perpendicular to the H direction between the two base main bodies 38 integrally formed with the flange portion 21. Alternatively, the displacement mechanisms 26 and 27 having the substantially triangular protruding member 121 may be used.

  That is, the sliding support 1 shown in FIGS. 8 and 9 includes a sliding plate 8 that is fixed to the lower surface 6 of the bridge girder 3 with bolts or the like and that has an upper sliding surface 5 on the lower surface, and an upper sliding surface. Two sliding plates 10 each having a lower side sliding surface 9 on the upper surface, which is slidably in contact with the surface 5 in the H direction and receives a load in the V direction of the bridge girder 3 via the upper side sliding surface 5 and the sliding plate 8. And a restoring force generating means 11 for generating a restoring force with respect to the relative displacement in the H direction of the bridge girder 3 with respect to the bridge pier 2 more than a certain level. The sliding plate 8 includes a sliding plate main body 122 extending in the H direction. A pair of protrusions that integrally protrude in the direction orthogonal to the H direction from the edge in the direction orthogonal to the H direction at the central portion of the sliding plate main body 122 in the H direction and have the upper side sliding surface 5 on the lower surface, respectively. And the base 24 of the restoring force generating means 11 A pair of base main bodies 38 that are arranged in a direction orthogonal to the H direction and are each composed of a truncated quadrangular pyramid, and a flange 21 that is integrally provided on the lower end surface 39 of each base main body 38 are provided. Each sliding plate 10 having the lower side sliding surface 9 on the upper surface is supported by the sliding plate support mechanism 25 in each base body 38 and is formed integrally with the flange portion 21 and the pair of base main bodies 38. The projecting member 121 shared by the displacement mechanisms 26 and 27 has an inclined surface 53 formed of an inclined flat surface as a displacement surface and an inclined surface 58 formed of an inclined flat surface as the other displacement surface. The sliding surface 66 formed of an inclined flat surface facing the inclined surface 53 fixed to the pier 2 via the flange 21 and the pair of base bodies 38 with a gap 65 is formed as a sliding plate. One end side of the main body 122 in the H direction The sliding surface 69, which is provided with a gap 68 and faces the inclined surface 58 fixed to the pier 2 via the flange portion 21 and the pair of base main bodies 38 with a gap 68, is formed as a sliding surface. It is provided on the other end side in the H direction of the plate body 122.

  8 and 9, the vibration in the H direction of the bridge girder 3 with respect to the bridge pier 2 based on the expansion and contraction of the bridge girder 3 due to a small earthquake or temperature change is also caused in the H direction of the upper sliding surface 5 with respect to the lower sliding surface 9. Allowing for slippage, preventing transmission of vibration in the H direction of the pier 2 due to a small earthquake to the bridge girder 3 so that an excessive load in the H direction does not occur on the bridge girder 3 in a small earthquake, The transmission of vibration in the H direction of the bridge girder 3 based on the expansion and contraction of the bridge girder 3 to the pier 2 is prevented, so that an excessive load in the H direction is not generated on the pier 2 in the expansion and contraction of the bridge girder 3 and The flexural vibration of the bridge girder 3 in the V direction due to traveling or the like is allowed by elastic expansion and contraction of the elastic plate 42, and relative vibration displacement in one direction in the H direction above a certain level on the bridge girder 2 with respect to the pier 2 in a large earthquake or the like Occurs The sliding surface 66 and the inclined surface 53 are brought into mutual contact with each other, and after such contact, sliding is caused between the sliding surface 66 and the inclined surface 53 to raise the bridge girder 3 so that the bridge girder 3 is moved in the V direction from the pier 2. The movement of the upper side sliding surface 5 to the lower side sliding surface 9 is released, and after such movement and release, the relative vibration displacement in the other direction in the H direction causes the sliding surface 66 and the inclined surface 53 to move. The bridge girder 3 is lowered through the sliding between the upper side sliding surface 5 and the lower side sliding surface 9 from the lower side sliding surface 9 is released to recover the contact of the upper side sliding surface 5 with the lower side sliding surface 9. Next, a large relative vibration displacement in the other direction in the H direction causes mutual contact between the sliding surface 69 and the inclined surface 58, and hereinafter, in the case of mutual contact between the sliding surface 66 and the inclined surface 53. Thus, the phases of the sliding surface 66 and the inclined surface 53 are the same. In the contact and the mutual contact of the sliding surface 69 and the inclined surface 58, the large vibration energy that causes the bridge girder 3 to have a relative displacement in the H direction beyond a certain level with respect to the pier 2 is converted into the potential energy of the bridge girder 3. The relative displacement in the H direction of the bridge girder 3 with respect to is not caused.

  By the way, in the above-mentioned sliding bearing 1, the base 24 or 90 made of a single body is used. Instead, as shown in FIG. 10, the lower base main body 131 and the lower base main body 131 are overlapped with each other. The base 24 having the base body 38 divided into two parts, which is composed of the upper base body 132 that is movable in the H direction and the V direction with respect to the lower base body 131, is also used. Good.

  That is, the sliding support 1 shown in FIG. 10 interposed between the bridge pier 2 and the bridge girder 3 to support the bridge girder 3 so as to be movable in the H direction with respect to the pier 2 is provided on the bottom surface of the bridge girder 3 via bolts or the like. A sliding plate 8 fixed to the lower surface 6 of the bridge girder 3 on the upper surface via a mounting plate 7 fixed to the upper surface 6 and having an upper side sliding surface 5 on the lower surface, and an H direction on the upper side sliding surface 5 A sliding plate 10 having a lower side sliding surface 9 on the upper surface and a lower side sliding surface 9 that receives a load in the V direction of the bridge girder 3 via the upper side sliding surface 5, the sliding plate 8 and the mounting plate 7. Restoring force generating means 11 for generating a restoring force with respect to a relative displacement in the H direction of a certain level or more of the bridge girder 3 with respect to.

  The restoring force generating means 11 of the sliding bearing 1 shown in FIG. 10 has a base body 38 that is divided into two parts including a lower base body 131 and an upper base body 132 and is integrated with the lower base body 131. And a base 24 that is fixed to the upper surface 22 of the pier 2 via anchor bolts and nuts 23 (see FIG. 1), etc. A sliding plate support mechanism 25 provided at the upper end in the direction, a pair of displacement mechanisms 26 and 27 provided on both side surfaces in the H direction of the lower base body 131 of the base 24, and an upper portion with respect to the lower side sliding surface 9 And a prohibiting mechanism 135 that prohibits a relative displacement of the side sliding surface 5 in the H direction beyond a certain level.

  The lower base body 131 made of a truncated quadrangular pyramid and integrally formed on the flange portion 21 at the lower end surface 141 has a flat upper end surface 142 extending in the H direction and a complement to the H direction. It has flat inclined surfaces 143 and 144 which are inclined with an angular relationship, and an upper base body 132 made of a quadrangular prism body has a flat upper end surface 145 extending in the H direction, and extends in the V direction. A pair of side end surfaces 146 and 147 facing each other in the H direction and a lower end surface 149 formed with a recess 148 for receiving the lower base body 131 are provided.

  In FIG. 10, the sliding plate support mechanism 25 is provided with a recess 41 formed on the upper end surface 145 of the upper base body 132, and is vulcanized or bonded to the upper base body 132 by being disposed in the recess 41. And a shock absorbing elastic plate 42 made of natural rubber or synthetic rubber, etc., and the sliding plate 10 is vulcanized or overlapped with the upper surface 43 of the elastic plate 42 at its lower surface 44 or recessed. 41, the sliding plate support mechanism 25 supports the sliding plate 10 on the upper base body 132 via the elastic plate 42, and the displacement mechanism 26 is As a displacement surface extending in a crossing direction with respect to the recess 51 formed in the inclined surface 143 of the lower base body 131 that is one side surface of the lower base body 131 in the H direction, and the lower side sliding surface 9. Upper side sliding surface 5 extending in the H direction and below And a sliding plate 54 that has a sloped surface 53 that is a flat surface that is sloped with respect to the side sliding surface 9 and that is disposed in the recess 51 and is fixed to the lower base body 131 on the back surface with respect to the sloped surface 53. Similarly to the displacement mechanism 26, the displacement mechanism 27 includes a recess 56 formed on the inclined surface 144 of the lower base body 131, which is the other side surface of the lower base body 131 in the H direction, and a lower side. As a displacement surface extending in the crossing direction with respect to the sliding surface 9, the upper surface sliding surface 5 extending in the H direction and an inclined surface 58 composed of a flat surface inclined with respect to the lower side sliding surface 9 are disposed in the recess 56. And a sliding plate 59 fixed to the lower base body 131 on the back surface with respect to the inclined surface 58. The recess 148 has a flat bottom surface 152 extending in the H direction and the H direction. Flat inclined surface 15 inclined with a complementary angle relationship And the inclined surface 150 that contacts the inclined surface 53 fixed to the pier 2 via the lower base body 131 and is inclined at the same angle as the inclined surface 53 faces the inclined surface 53. The inclined surface 151 that is in contact with the inclined surface 58 fixed to the pier 2 via the lower base body 131 and is inclined at the same angle as the inclined surface 58 faces the inclined surface 58. In the case of this example, the sliding plates 54 and 59 are similar to the sliding plates 32 and 33 and the sliding plates 8 and 10, and the synthetic resin having a low friction characteristic such as polytetrafluoroethylene resin or the like. The synthetic resin may be made of a synthetic resin containing a reinforcing material in which a reinforcing material such as glass fiber and organic fiber is mixed.

  The prohibiting mechanism 135 includes a pair of prohibiting plates 155 and 156 that are arranged with a gap between the upper base body 132 in the H direction and fixed to the mounting plate 7 by bolts, welding, and the like, and the prohibiting plates 155 and 156. Reinforcing members 157 and 158 that reinforce each of the prohibiting plates 155 and 156 are fixed to the respective mounting plates 7 by bolts, welding, and the like, and the pair of prohibiting plates 155 and 156 are provided with the sliding plate 8. In the relative movement of the upper base body 132 in the H direction, the upper base body 132 collides with the side end surfaces 146 and 147 of the upper base body 132 so as to prohibit further relative movement of the upper base body 132 in the H direction. It has become.

  The above-described sliding bearing 1 shown in FIG. 10 is adapted to cause vibrations in the H direction of the bridge girder 3 relative to the pier 2 based on expansion and contraction of the bridge girder 3 due to a small earthquake or temperature change, as shown in FIG. Allowed by sliding in the H direction of the side sliding surface 5, prevents transmission of the vibration in the H direction of the pier 2 due to a small earthquake to the bridge girder 3, and an excessive load in the H direction is generated on the bridge girder 3 in a small earthquake. The transmission of the displacement in the H direction of the bridge girder 3 to the pier 2 due to expansion and contraction of the bridge girder 3 due to temperature change is prevented, and an excessive load in the H direction is applied to the pier 2 in the expansion and contraction of the bridge girder 3. Then, bending vibration of the bridge girder 3 in the V direction due to traveling of the automobile is allowed by elastic expansion and contraction of the elastic plate 42.

  In the sliding bearing 1 shown in FIG. 10, when a relative vibration displacement in one direction in the H direction of a certain level or more occurs in the bridge girder 3 with respect to the pier 2 in a large earthquake or the like, for example, as shown in FIG. After the side end surface 146 of the upper base body 132 collides with the upper base body 132 to prevent further relative movement in the H direction, the upper base body 132 slides between the inclined surface 150 and the inclined surface 53. As the upper base body 132 is raised, the bridge girder 3 is raised, and the bridge girder 3 is moved from the pier 2 in the V direction, and after such movement, the relative vibration displacement in the other direction in the H direction causes an inclined surface. The bridge girder 3 is lowered with the lowering of the upper base body 132 through the sliding between 150 and the inclined surface 53 to return the bridge girder 3 to its original position, and then the large relative in the other direction in the H direction. In the case of vibration displacement, the prohibition plate 15 After the side end surface 147 of the upper base main body 132 collides with the upper base body 132 to prevent further relative movement in the H direction, the upper base main body 132 slips between the inclined surface 151 and the inclined surface 58. In the following, the same operation as in the case of the slip between the inclined surface 150 and the inclined surface 53 is performed, and thus the slip between the inclined surface 150 and the inclined surface 53 and the inclined surface 151 and the inclined surface are performed. 58, the vibration energy, which is a large kinetic energy that causes the bridge girder 3 to have a relative displacement in the H direction beyond a certain level with respect to the bridge pier 2, is converted into the positional energy of the bridge girder 3 and the bridge girder 3 with respect to the pier 2 is slipped. The excessive displacement in the H direction is not caused.

  In the above-described sliding bearing 1, at least a part of the restoring force generating means 11 or 80 is provided on the base 24 or 90 that supports the sliding plate 8 or the sliding plate 10 having the upper side sliding surface 5. As shown in FIG. 14, the restoring force generating means 11 may be provided separately from the sliding plate 8 or the base 24 or 90.

  13 and 14 is fixed to the lower surface 6 of the bridge girder 3 on the upper surface via a mounting plate 7 fixed to the lower surface 6 of the bridge girder 3 via bolts and the like. A sliding plate 8 having a side sliding surface 5 on the lower surface, and a bridge girder 3 through the upper side sliding surface 5, the sliding plate 8 and the mounting plate 7 while being in contact with the upper side sliding surface 5 slidably in the H direction. A sliding plate 10 having a lower sliding surface 9 on the upper surface for receiving a load in the V direction, a support base 161 for supporting the sliding plate 10 on the pier 2, and a relative degree of the bridge girder 3 with respect to the pier 2 in a certain H direction. And a restoring force generating means 11 for generating a restoring force against the displacement.

  The support base 161 includes a support base body 163 made of a quadrangular prism body that supports the sliding plate 10 with an upper end surface 162, and a flange portion 164 provided integrally with the support base body 163. Is fixed to the upper surface 22 of the pier 2 via anchor bolts / nuts 23 (see FIG. 1) or the like, and the sliding plate 10 is attached to the support base body 163 via the sliding plate support mechanism 25 (see FIG. 1). It is fixed to the upper end surface 162.

  The restoring force generating means 11 shown in FIGS. 13 and 14 includes a bridge pier side fixing base 167 fixed to the upper surface 22 of the pier 2 with anchor bolts and nuts 166 at the flange portion 165, and the mounting plate 7 and A bridge girder-side fixing base 169 fixed to the lower surface 6 of the bridge girder 3 via bolts or the like is provided.

  In addition to the flange portion 165, the pier side fixing base 167 includes a fixing pin 171 formed integrally with the flange portion 165, and an elastic member 172 for shock absorption through which the fixing pin 171 passes and is vulcanized and bonded to the flange portion 165. And a displacement member 173 in which the upper end portion of the fixing pin 171 is inserted with a gap and is vulcanized and bonded to the elastic member 172. The displacement member 173 intersects the lower sliding surface 9 in a crossing direction. And has an inverted V-shaped upper surface composed of a pair of flat inclined surfaces 174 and 175 which are inclined with a complementary angle to each other in the H direction.

  The bridge girder-side fixing base 169 is reversely formed of a pair of flat inclined surfaces 176 and 177 that are integrally formed with the flange portion 165 in addition to the flange portion 168 and are inclined with a complementary angle with respect to the H direction. A sliding plate having a fixed base body 178 having a V-shaped lower surface, and a sliding surface 180 which is fixed to the inclined surface 176 and which is an inclined flat surface as a facing surface facing the inclined surface 174 with a gap 179. 181 and a sliding plate 184 having a sliding surface 183 formed of an inclined flat surface as an opposing surface that is fixed to the inclined surface 177 and faces the inclined surface 175 with a gap 182.

  The inclined surface 174 and the sliding surface 180 fixed to the pier 2 via the pier side fixing base 167 have the same inclination angle, and the inclination fixed to the pier 2 via the pier side fixing base 167. The surface 175 and the sliding surface 183 have the same inclination angle.

  The sliding bearing 1 having the restoring force generating means 11 shown in FIGS. 13 and 14 is configured to cause vibration in the H direction of the bridge girder 3 to the pier 2 based on the expansion and contraction of the bridge girder 3 due to a small earthquake or temperature change with respect to the lower sliding surface 9. Allowing the upper sliding surface 5 to slide in the H direction and preventing transmission of the vibration in the H direction of the pier 2 due to a small earthquake to the bridge girder 3, an excessive load in the H direction is applied to the bridge girder 3 in a small earthquake. In this way, the transmission of the displacement in the H direction of the bridge girder 3 to the pier 2 due to the expansion and contraction of the bridge girder 3 due to temperature change is prevented, and an excessive load in the H direction is generated on the pier 2 in the expansion and contraction of the bridge girder 3 In the meantime, bending vibration of the bridge girder 3 in the V direction due to traveling of the automobile and the like is allowed by elastic expansion and contraction of the elastic plate 42 (see FIG. 1). In the H direction When the relative vibration displacement in one direction occurs, the sliding bearing 1 causes mutual contact between the inclined surface 174 and the sliding surface 180, for example, as shown in FIG. The bridge girder 3 is lifted by sliding between the surface 180 and the bridge girder 3 is moved in the V direction from the pier 2 to release the contact of the upper side sliding surface 5 with the lower side sliding surface 9, thus moving. After the release, the bridge girder 3 is lowered by the relative vibration displacement in the other direction in the H direction through the sliding between the inclined surface 174 and the sliding surface 180, and from the lower side sliding surface 9 of the upper side sliding surface 5. Is released from the V-direction to restore the contact of the upper-side sliding surface 5 with the lower-side sliding surface 9, and then, in the case of a large relative vibration displacement in the other direction in the H-direction, the inclined surface 175 and the sliding surface Causing mutual contact with H.183, The pier 2 operates in the same manner as in the case of mutual contact between the slope 174 and the sliding surface 180, and thus in the mutual contact between the inclined surface 174 and the sliding surface 180 and the mutual contact between the inclined surface 175 and the sliding surface 183, On the other hand, a large vibration energy that causes a relative displacement in the H direction at a certain level or more in the bridge girder 3 is converted into a positional energy of the bridge girder 3 so as not to cause an excessive relative displacement in the H direction of the bridge girder 2 with respect to the pier 2. ing.

  In the restoring force generating means 11 shown in FIGS. 13 and 14, the upper surface of the displacement member 173 of the pier side fixing base 167 is formed in an inverted V shape comprising a pair of flat inclined surfaces 174 and 175, and the bridge girder side fixing base 169. The lower surface of the fixed base body 178 is formed in an inverted V shape consisting of a pair of flat inclined surfaces 176 and 177. Instead of this, like the restoring force generating means 11 shown in FIG. The upper surface of the displacement member 173 of 167 is formed into a continuous semicircular convex surface formed of a pair of continuous semicircular convex surfaces 191 and 192, and the lower surface of the fixing base body 178 of the bridge girder side fixing base 169 is formed as a pair of continuous semicircular concave surfaces. 193 and 194 and semi-circular convex surfaces 191 and 192 are formed into a continuous semi-circular concave shape larger than the radius of curvature of the upper surface of the semi-circular convex surface 191 and 192. When the relative vibration displacement in one direction in the H direction of the bridge girder 3 with respect to the bridge pier 2 is greater than a certain value, for example, as shown in FIG. After such contact, a slip is generated between the semicircular convex surface 191 and the semicircular concave surface 193 to raise the bridge girder 3, and the bridge girder 3 is moved from the pier 2 in the V direction to lower the lower sliding surface 9 of the upper sliding surface 5. After releasing the contact to the bridge, the bridge girder 3 is lowered through the slip between the semicircular arc convex surface 191 and the semicircular arc concave surface 193 with the relative vibration displacement in the other direction in the H direction after such movement and release, The separation of the upper side sliding surface 5 from the lower side sliding surface 9 in the V direction is released to restore the contact of the upper side sliding surface 5 with the lower side sliding surface 9, and then the other direction in the H direction is large. In relative vibration displacement, the semicircular convex surface 192 and Then, mutual contact with the arcuate concave surface 194 is caused, and thereafter, the same operation as in the case of mutual contact between the semicircular arc convex surface 191 and the semicircular arc concave surface 193 is performed. The large vibration energy that causes the bridge girder 3 to have a relative displacement in the H direction of a certain level or more with respect to the pier 2 is converted into the positional energy of the bridge girder 3 in the mutual contact of the semicircular arc convex surface 192 and the semicircular arc concave surface 194. Thus, the relative displacement in the H direction of the bridge girder 3 with respect to the pier 2 may be prevented.

  Also in the restoring force generating means 11 shown in FIG. 16, a sliding plate is fixed to the lower surface of the continuous semicircular concave fixing base body 178 composed of the semicircular concave surfaces 193 and 194 along the lower surface. A continuous semicircular concave surface formed of two semicircular concave surfaces may be opposed to the semicircular arc convex surfaces 191 and 192.

  Further, the restoring force generating means 11 may be as shown in FIG. 18 includes a pair of pier-side fixing bases 203 and 204 fixed to the upper surface 22 of the pier 2 via anchor bolts and nuts 201 and 202 and arranged side by side in the H direction. And a pair of bridge girder-side fixing bases 207 and 208 that are fixed to the lower surface 6 of the bridge girder 3 via the mounting plate 7 and bolts or the like at the flange portions 205 and 206 and arranged in the H direction. .

  The pier side fixing base 203 has an inclined surface 210 composed of a flat surface inclined with respect to the upper side sliding surface 5 and the lower side sliding surface 9 extending in the H direction on the upper surface. The upper surface has an inclined surface 211 made of a flat surface inclined with respect to the upper side sliding surface 5 and the lower side sliding surface 9, and is fixed to the pier 2 via the pier side fixing base 203 and inclined. The inclined surface composed of the surface 210 and the inclined surface 211 is a displacement surface extending in the crossing direction with respect to the lower-side sliding surface 9.

  The bridge girder-side fixing base 207 is formed integrally with the collar part 205 in addition to the collar part 205 and has a curved surface 216 which is convex downward as a facing surface facing the inclined surface 210 which is a displacement surface with a gap 215. The bridge girder-side fixing base 208 is formed integrally with the flange portion 206 and has a gap 218 on the inclined surface 211 as a displacement surface in addition to the flange portion 206. It has a facing member 220 having a convex curved surface 219 below as a facing facing surface.

  In the restoring force generating means 11 shown in FIG. 18, in the case of a large earthquake or the like, the relative vibration displacement in one direction in the H direction of the bridge girder 3 with respect to the bridge pier 2 in a certain direction H or more is constant, for example, as shown in FIG. And the inclined surface 211 are brought into mutual contact, and after such contact, the bridge girder 3 is raised by causing a slip between the curved surface 219 and the inclined surface 211, and the bridge girder 3 is moved in the V direction from the pier 2 After the contact of the upper side sliding surface 5 with the lower side sliding surface 9 is released, and after such movement and release, the sliding between the curved surface 219 and the inclined surface 211 is caused by relative vibration displacement in the other direction in the H direction. The bridge girder 3 is lowered through the upper side, the separation of the upper side sliding surface 5 from the lower side sliding surface 9 in the V direction is released, and the contact of the upper side sliding surface 5 with the lower side sliding surface 9 is recovered. , Large relative vibration in the other direction in the H direction In the displacement, as shown in FIG. 20, the curved surface 216 and the inclined surface 210 are brought into mutual contact, and thereafter, the same operation as in the case of mutual contact between the curved surface 219 and the inclined surface 211 is performed. Thus, in the mutual contact between the curved surface 219 and the inclined surface 211 and the mutual contact between the curved surface 216 and the inclined surface 210, large vibration energy that causes a relative displacement in the H direction of the bridge girder 3 to a certain level or more with respect to the bridge pier 2. Is converted into the potential energy of the bridge girder 3 so as not to cause an excessive displacement in the H direction of the bridge girder 3 with respect to the pier 2.

  When the above-mentioned sliding support 1 is provided in each of the continuous girders in which the bridge girders 3 are arranged in series, the force transmitted between the bridge pier 2 and the bridge girders 3 is always in the wind or earthquake. The sliding support 1 can be arbitrarily adjusted so that it can be appropriately shared and received.

  Further, by reducing the frictional resistance of the upper side sliding surfaces 5, 76 and the lower side sliding surfaces 9, 78, the horizontal restraining force of the lower side sliding surfaces 9, 78 on the upper side sliding surfaces 5, 76 can be reduced. In the case of a concrete bridge girder 3 of temperature change, excellent followability to a slow horizontal displacement due to drying shrinkage and creep and the displacement due to rotational deformation of the end of the bridge girder 3 due to the deflection of the live load of the bridge girder 3 is obtained. be able to.

  The bridge girder 3 is supported on the pier 2 via the sliding bearing 1, but an origin return mechanism for returning the bridge girder 3 to its original position after the extinction of an earthquake or the like is interposed between the bridge girder 3 and the pier 2 Alternatively, a damping mechanism for effectively attenuating the vibration displacement of the bridge girder 3 with respect to the pier 2 in an earthquake or the like may be interposed between the bridge girder 3 and the pier 2 in the same manner.

It is front explanatory drawing of the preferable example of this invention. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is front explanatory drawing of another preferable example of this invention. It is operation | movement explanatory drawing of the example shown in FIG. It is front explanatory drawing of another preferable example of this invention. FIG. 7 is an exploded perspective view of the example shown in FIG. 6. It is front explanatory drawing of another preferable example of this invention. It is a disassembled perspective explanatory drawing of the example shown in FIG. It is front explanatory drawing of another preferable example of this invention. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is front explanatory drawing of another preferable example of this invention. It is front expansion explanatory drawing of the restoring force generation | occurrence | production means of the example shown in FIG. It is operation | movement explanatory drawing of the restoring force generation | occurrence | production means of the example shown in FIG. It is front expansion explanatory drawing of the restoring force generation | occurrence | production means of another preferable example of this invention. It is operation | movement explanatory drawing of the restoring force generation | occurrence | production means of the example shown in FIG. It is front expansion explanatory drawing of the restoring force generation | occurrence | production means of another preferable example of this invention. It is operation | movement explanatory drawing of the restoring force generation | occurrence | production means of the example shown in FIG. It is operation | movement explanatory drawing of the restoring force generation | occurrence | production means of the example shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sliding bearing 2 Bridge pier 3 Bridge girder 5 Upper side sliding surface 6 Lower surface 7 Mounting plate 8 Sliding plate 9 Lower side sliding surface 10 Sliding plate

Claims (9)

  A sliding bearing for a structure interposed between the lower structure and the upper structure to support the upper structure so as to be movable in the horizontal direction with respect to the lower structure, and is arranged on the upper structure side. And a lower side disposed on the lower structure side so as to be in sliding contact with the upper side sliding surface in a horizontal direction and to receive a load of the upper structure through the upper side sliding surface. And a restoring force generating means for generating a restoring force with respect to a relative displacement of the upper structure with respect to a certain horizontal direction relative to the lower structure. The restoring force generating means includes the lower structure and the upper structure. A displacement surface that is fixed to one of the objects and extends in a direction intersecting with the lower sliding surface, and a facing surface that faces the displacement surface. In relative displacement in the horizontal direction Sliding bearings for structures has an upper structure based on the contact of the anti-surface to move from the lower structure in the vertical direction.   Each of the upper side sliding surface and the lower side sliding surface has a flat surface extending in the horizontal direction, and each of the displacement surface and the opposing surface is a flat surface inclined with respect to the upper side sliding surface and the lower side sliding surface. A sliding bearing for a structure according to claim 1, comprising:   2. The structure for a structure according to claim 1, wherein each of the upper side sliding surface and the lower side sliding surface has a flat surface extending in the horizontal direction, and each of the displacement surface and the opposing surface has a curved surface. Sliding bearing.   The sliding bearing for a structure according to claim 3, wherein the displacement surface has one of a curved convex surface and a curved concave surface, and the opposing surface has the other of the curved convex surface and the curved concave surface.   Each of the upper side sliding surface and the lower side sliding surface has a flat surface extending in the horizontal direction, the displacement surface has one of a curved surface and a flat surface, and the displacement surface is a curved surface and a flat surface. 2. A sliding bearing for a structure according to claim 1, having the other of the surfaces.   The displacement surface extends continuously with one of the upper side sliding surface and the lower side sliding surface, and the opposing surface extends continuously with the other of the upper side sliding surface and the lower side sliding surface. Item 6. A sliding bearing for a structure according to any one of Items 1 to 5.   The sliding bearing for a structure according to any one of claims 1 to 5, wherein the displacement surface and the opposing surface are provided independently with respect to the upper side sliding surface and the lower side sliding surface.   One of the displacement surface and the opposing surface extends continuously with one of the upper side sliding surface and the lower side sliding surface, and the other of the displacement surface and the opposing surface is the upper side sliding surface and the lower side. The sliding bearing for a structure according to any one of claims 1 to 5, wherein the sliding bearing is provided separately and independently for the other of the sliding surfaces.   The structure according to any one of claims 1 to 8, wherein the restoring force generating means includes a prohibiting mechanism that prohibits a relative displacement in a horizontal direction of the upper side sliding surface with respect to the lower side sliding surface beyond a certain level. Sliding bearing for.

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