JP6249872B2 - Sliding bearing and seismic isolation structure - Google Patents

Description

  The present invention relates to a sliding bearing, a seismic isolation structure, and a stopper for a sliding bearing.

  As a sliding support, for example, a configuration described in Patent Document 1 below is known. This sliding bearing is located between the lower heel fixed to the lower structure, the upper ridge fixed to the upper structure and arranged to be relatively displaceable in the horizontal direction with respect to the lower ridge, and the lower heel and the upper ridge. And a slider that is slidably disposed in a horizontal direction on a sliding surface provided on at least one of the lower and upper eyelids. The slider slides in the horizontal direction on the sliding surface in accordance with the relative displacement of the lower eyelid and the upper eyelid in the horizontal direction.

US Pat. No. 8,484,911

However, in the conventional sliding bearing, a large earthquake unexpectedly occurs, and the horizontal relative displacement between the lower structure and the upper structure may exceed the allowable range. In this case, when the superstructure is arranged in a seismic isolation pit formed in a concave shape, the superstructure and the seismic isolation pit collide and interfere with each other, for example, damage to the superstructure occurs. sell.
As one means for solving such a problem, it is conceivable to employ a large sliding bearing. However, in this case, for example, the cost of sliding support tends to increase. In this case, when the superstructure is disposed in the seismic isolation pit, the seismic isolation pit needs to be enlarged, and the cost is likely to increase further.

  The present invention has been made in consideration of such circumstances, and a sliding bearing capable of responding to unexpected large vibrations while suppressing the increase in size and simplifying the structure. The purpose is to provide.

In order to solve the above problems, the present invention proposes the following means.
The sliding bearing according to the present invention includes a lower rod fixed to the lower structure, an upper rod fixed to the upper structure and arranged to be relatively displaceable in a horizontal direction with respect to the lower flange, the lower rod and the upper A slider that is located between the lower collar and the upper collar, and that is slidable in a horizontal direction on a sliding surface provided on at least one of the lower collar and the upper collar, and the slider includes the lower collar And a sliding bearing that slides in the horizontal direction on the sliding surface in accordance with a relative displacement in the horizontal direction between the upper collar and the upper collar. When the lower heel and the upper heel are relatively displaced in the horizontal direction, a stopper that restricts further relative displacement between the lower heel and the upper heel is connected by contacting the other from the outside in the horizontal direction , One of the lower arm and the upper arm The relative displacement in the horizontal direction with respect to the slider is restricted, and on the other side, the sliding surface and an auxiliary stopper capable of coming into contact with the slider from the outside in the horizontal direction are provided. When the stopper that restricts relative displacement with respect to the slider is plastically deformed in the horizontal direction by the lower collar or the upper collar, the auxiliary stopper comes into contact with the slider, so that the slider slides on the sliding surface of the slider. Further sliding is restricted, and both the stopper and the auxiliary stopper are provided in common to the lower eyelid or the upper eyelid .

In this case, when an expected vibration occurs and the lower and upper eyelids are relatively displaced in the horizontal direction, the slider slides on the sliding surface, and seismic isolation performance is exhibited.
On the other hand, when unexpectedly large vibrations occur, the slider slides on the sliding surface and the lower collar and upper collar are displaced relatively in the horizontal direction, and the stopper is placed on the lower collar or upper collar from the outside in the horizontal direction. Abut. This restricts further relative displacement between the lower eyelid and the upper eyelid.

  When unexpectedly large vibrations occur, even if the stopper restricts the horizontal relative displacement between the lower collar and the upper collar, the lower collar and the upper collar are forcibly displaced in the horizontal direction. there is a possibility. In this case, the slider further slides on the sliding surface while the lower eyelid or upper eyelid plastically deforms the stopper in the horizontal direction. At this time, the auxiliary stopper comes into contact with the slider from the outside in the horizontal direction, and further sliding on the sliding surface of the slider is restricted. Thus, the auxiliary stopper restricts the forced relative displacement between the lower rod and the upper rod in the horizontal direction via the slider.

  In this case, since both the stopper and the auxiliary stopper are provided in common for the lower eyelid or the upper eyelid, the stopper and the auxiliary stopper are concentrated on either the lower eyelid or the upper eyelid, It is possible to simplify the structure of either one of the upper collars.

The sliding bearing according to the present invention includes a lower rod fixed to the lower structure, an upper rod fixed to the upper structure and arranged to be relatively displaceable in a horizontal direction with respect to the lower flange, the lower rod and the upper A slider that is located between the lower collar and the upper collar, and that is slidable in a horizontal direction on a sliding surface provided on at least one of the lower collar and the upper collar, and the slider includes the lower collar And a sliding bearing that slides in the horizontal direction on the sliding surface in accordance with a relative displacement in the horizontal direction between the upper collar and the upper collar. When the lower heel and the upper heel are relatively displaced in the horizontal direction, a stopper that restricts further relative displacement between the lower heel and the upper heel is connected by contacting the other from the outside in the horizontal direction, In the stopper, the lower collar and the upper collar are horizontal. The lower shoe or the upper shoe abuts on the stopper when the relative displacement in, comprises a ring member which surrounds the entire circumference from the outside in the horizontal direction, the ring material, the lower shoe the stopper is connected or It connects with the said upper collar via a connection part, The said connection part is provided with the some rib material arrange | positioned at intervals in the circumferential direction of the said ring material, It is characterized by the above-mentioned .

  In this case, since the stopper includes the ring material, the relative displacement between the lower eyelid and the upper eyelid is regulated by the ring material regardless of the direction in which the lower eyelid and the upper eyelid are relatively displaced along the horizontal direction. can do.

  In this case, since the connecting portion includes a plurality of rib members arranged at intervals in the circumferential direction of the ring material, for example, the connecting portion continuously extends over the entire circumference in the circumferential direction of the ring material. Compared with the case etc., the connection part can be reduced in weight.

The sliding bearing according to the present invention includes a lower rod fixed to the lower structure, an upper rod fixed to the upper structure and arranged to be relatively displaceable in a horizontal direction with respect to the lower flange, the lower rod and the upper A slider that is located between the lower collar and the upper collar, and that is slidable in a horizontal direction on a sliding surface provided on at least one of the lower collar and the upper collar, and the slider includes the lower collar And a sliding bearing that slides in the horizontal direction on the sliding surface in accordance with a relative displacement in the horizontal direction between the upper collar and the upper collar. When the lower heel and the upper heel are relatively displaced in the horizontal direction, a stopper that restricts further relative displacement between the lower heel and the upper heel is connected by contacting the other from the outside in the horizontal direction, The stopper is connected to the stopper. The shoe or the upper shoe, characterized that you have removably coupled.

  In this case, since the stopper is detachably connected to the lower collar or the upper collar, for example, unexpectedly large vibration occurs, and the stopper is damaged when it is plastically deformed by the lower collar or the upper collar. When this occurs, the stopper can be replaced with a new stopper that is not damaged.

  The seismic isolation structure according to the present invention includes an upper structure and a lower structure, and the sliding support disposed between the upper structure and the lower structure.

A stopper for sliding support according to a reference example of the present invention, a lower rod fixed to the lower structure, an upper rod fixed to the upper structure and arranged to be relatively displaceable in the horizontal direction with respect to the lower flange, A slider positioned between the lower rod and the upper rod and disposed on a sliding surface provided on at least one of the lower rod and the upper rod so as to be slidable in a horizontal direction, and The slider is a sliding bearing stopper attached to a sliding bearing that slides in the horizontal direction on the sliding surface in accordance with the relative displacement of the lower collar and the upper collar in the horizontal direction. It is connected to one of the upper collars, and when the lower collar and the upper collar are relatively displaced in the horizontal direction, the lower collar and the upper collar are brought into contact with either one from the outside in the horizontal direction. Restrict further relative displacement with the heel And wherein the door.

In this case, when an expected vibration occurs and the lower and upper eyelids are relatively displaced in the horizontal direction, the slider slides on the sliding surface, and seismic isolation performance is exhibited.
On the other hand, when unexpectedly large vibrations occur, the slider slides on the sliding surface and the lower collar and upper collar are displaced relatively in the horizontal direction, and the stopper is placed on the lower collar or upper collar from the outside in the horizontal direction. Abut. This restricts further relative displacement between the lower eyelid and the upper eyelid.

According to the first aspect of the present invention, when an unexpectedly large vibration occurs, the horizontal relative displacement between the lower eyelid and the upper eyelid can be regulated to be constant by the stopper. Therefore, it becomes possible to add a fail-safe function to the sliding bearing, and while restricting excessive relative displacement along the horizontal direction between the lower structure and the upper structure, the size of the sliding bearing is suppressed and the structure is simplified. Can be achieved.
Further, when the stopper restricts relative displacement between the lower eyelid and the upper eyelid along the horizontal direction, the stopper comes into contact with the lower eyelid or the upper eyelid from the outside in the horizontal direction. Therefore, it becomes possible to regulate the displacement of the lower eyelid or the upper eyelid in the horizontal direction directly by the stopper, and the relative displacement between the lower eyelid and the upper eyelid can be effectively restricted.

  According to the invention which concerns on Claim 2, the auxiliary stopper can control the relative displacement to the forcible horizontal direction of a lower collar and an upper collar. Therefore, an excessive relative displacement along the horizontal direction between the lower structure and the upper structure can be reliably regulated.

  According to the invention of claim 3, it is possible to consolidate the stopper and the auxiliary stopper on either the lower eyelid or the upper eyelid and simplify the structure of the other of the lower eyelid or the upper eyelid. it can. Therefore, the structure of the entire sliding bearing can be easily simplified.

  According to the fourth aspect of the invention, the relative displacement between the lower eyelid and the upper eyelid can be regulated by the ring material regardless of the direction in which the lower eyelid and the upper eyelid are relatively displaced along the horizontal direction. Therefore, it is possible to easily apply the sliding support in various ways.

  According to the invention of claim 5, since the weight of the connecting portion can be reduced, for example, the amount of the material forming the connecting portion can be suppressed, and the cost of the sliding bearing can be reliably reduced. .

  According to the sixth aspect of the present invention, when the stopper is damaged, the stopper can be replaced with a new stopper that is not damaged. Therefore, the maintainability of the sliding bearing can be improved.

  According to the invention which concerns on Claim 7, the said slide bearing is arrange | positioned between the upper structure and the lower structure. Therefore, while restricting excessive relative displacement along the horizontal direction between the lower structure and the upper structure, it is possible to reduce the size of the entire seismic isolation structure and simplify the structure.

According to the invention which concerns on Claim 8, when a big vibration unexpectedly arises, the horizontal relative displacement amount of a lower eyelid and an upper eyelid can be uniformly controlled with a stopper. Therefore, it becomes possible to add a fail-safe function to the sliding bearing, and while restricting excessive relative displacement along the horizontal direction between the lower structure and the upper structure, the size of the sliding bearing is suppressed and the structure is simplified. Can be achieved.
Further, when the stopper restricts relative displacement between the lower eyelid and the upper eyelid along the horizontal direction, the stopper comes into contact with the lower eyelid or the upper eyelid from the outside in the horizontal direction. Therefore, for example, compared with the case where the horizontal displacement between the lower rod and the upper rod is regulated by the slider engaging the lower rod and the upper rod separately from the inner side in the horizontal direction, etc. The relative displacement with the upper arm can be effectively controlled.
In addition, by attaching the stopper to the existing sliding bearing, the above-described effects can be achieved even in a seismically isolated structure that has already been constructed.

It is a front view showing a bridge concerning one embodiment of the present invention. It is a perspective view of the slide bearing which comprises the bridge shown in FIG. It is a side view of the lower collar which comprises the sliding bearing shown in FIG. FIG. 3 is a top view of the sliding bearing shown in FIG. 2. FIG. 5 is a cross-sectional view taken along the line XX shown in FIG. 4. FIG. 2 is a diagram showing a state in which the lower structure and the upper structure are relatively displaced in the horizontal direction in the bridge shown in FIG. 1. FIG. 6 is a diagram showing a state in which the lower rod and the upper rod are relatively displaced in the horizontal direction and further relative displacement is restricted by the stopper in the sliding bearing shown in FIG. 5. FIG. 8 is a view showing a state in which the lower collar and the upper collar are forcibly relatively displaced in the horizontal direction in the sliding bearing shown in FIG. 7 and further relative displacement is restricted by the auxiliary stopper. FIG. 3 is a load displacement history loop obtained by performing a simulation analysis on the stopper of the sliding bearing shown in FIG. 2 and showing a relationship between displacement and load. FIG. 3 is a load displacement history loop obtained by performing a simulation analysis on the auxiliary stopper of the sliding bearing shown in FIG. 2 and showing the relationship between displacement and load.

Hereinafter, a bridge (base-isolated structure) 10 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the bridge 10 includes a lower structure 11, an upper structure 12, and a sliding bearing 20. In the illustrated example, the bridge 10 is a so-called girder bridge.

  The lower structure 11 includes a plurality of bridge piers 13 that are installed at intervals along a direction in which the bridge 10 continues in the horizontal direction (hereinafter referred to as “continuous direction”). The pier 13 is, for example, a reinforced concrete structure, a steel reinforced concrete structure, or the like, and is erected on a foundation constructed in the ground.

  The upper structure 12 is a so-called bridge girder and is bridged on a plurality of bridge piers 13. The upper structure 12 includes a main girder 14 and a floor slab 15. The main girder 14 extends in the continuous direction and is constructed on the pier 13. A pair of main girders 14 are arranged at intervals in a direction perpendicular to the continuous direction (hereinafter referred to as “orthogonal direction”) in the horizontal direction. The main girder 14 is, for example, a steel structure, a reinforced concrete structure, a steel reinforced concrete structure, or the like. The floor slab 15 forms the road surface of the bridge 10. The floor slab 15 extends in the continuous direction and is supported by the main beam 14.

  The sliding bearing 20 is disposed between the lower structure 11 and the upper structure 12. The sliding bearings 20 are individually arranged on the plurality of bridge piers 13. Two sliding bearings 20 are arranged at intervals in the orthogonal direction, and are arranged between the pier 13 and the main girder 14.

  As shown in FIGS. 2 to 5, the sliding bearing 20 includes a lower rod 21, an upper rod 22, and a slider 23. The lower collar 21 is fixed to the lower structure 11. The upper collar 22 is fixed to the upper structure 12 and is disposed so as to be relatively displaceable in the horizontal direction with respect to the lower collar 21. The lower rod 21 and the upper rod 22 are both formed in a disc shape and are arranged coaxially with each other.

Hereinafter, the common axis through which the central axes of the lower rod 21 and the upper rod 22 pass is referred to as the axis O of the sliding bearing 20. The axis O extends in the vertical direction. When the sliding bearing 20 is viewed from above, the direction orthogonal to the axis O is referred to as the radial direction (the radial direction of the ring material), and the direction of circling around the axis O is referred to as the circumferential direction (the circumferential direction of the ring material). .
The lower rod 21 and the upper rod 22 may be formed of, for example, a cast steel product, a cast iron product, a forged product, or the like, or may be formed by cutting an SM material or an SN material.

  As shown in FIG. 5, the sliding bearing 20 has a so-called single pendulum structure, and the horizontal displacement of the upper rod 22 (one of the lower rod and the upper rod) with respect to the slider 23 is restricted. . A slide surface 24 on which the slider 23 can slide in the horizontal direction is provided on the lower rod 21 (the other of the lower rod and the upper rod). In the present embodiment, the lower collar 21 is further provided with an auxiliary stopper 25 and a flange portion 26.

The auxiliary stopper 25 protrudes upward from the lower eyelid 21. The auxiliary stopper 25 is formed in a cylindrical shape arranged coaxially with the axis O. The auxiliary stopper 25 is integrally formed of the same material as the lower collar 21. The auxiliary stopper 25 is disposed on the outer peripheral edge of the lower collar 21. There is a vertical gap between the auxiliary stopper 25 and the upper collar 22.
The sliding surface 24 is formed over the entire area of the lower collar 21 located inside the auxiliary stopper 25. The sliding surface 24 is formed in a concave spherical shape that is concave toward the lower side. The sliding surface 24 is arranged coaxially with the axis O.

As shown in FIG. 4, the flange portion 26 protrudes from the lower collar 21 toward the outside in the radial direction. A plurality of flange portions 26 are arranged at intervals in the circumferential direction. The plurality of flange portions 26 have the same size and the same shape. Each flange portion 26 is formed in a triangular shape that protrudes outward in the radial direction in the top view. The even number of flange portions 26 in the circumferential direction, six in the illustrated example, are provided at equal intervals.
Each flange portion 26 is fixed to the lower structure 11 by a lower bolt (not shown). The lower bolt is inserted into the flange portion 26 from above. The lower collar 21 is fixed to the lower structure 11 via a flange portion 26.

As shown in FIG. 5, the upper collar 22 is provided with a housing 28 that holds the slider 23. The housing 28 extends downward from the upper collar 22. The housing 28 is formed in a columnar shape arranged coaxially with the axis O. A recess 29 into which the slider 23 is fitted is provided at the lower end of the housing 28. The inner surface of the recess 29 is formed in a concave spherical shape that becomes concave upward. The recess 29 is disposed coaxially with the axis O. The curvature of the inner surface of the recess 29 is larger than the curvature of the sliding surface 24.
The upper collar 22 is fixed to the upper structure 12 by an upper bolt (not shown). The upper bolt is inserted into the upper flange 22 from the lower side. A plurality of the upper bolts are arranged at intervals in the circumferential direction so as to surround the housing 28 from the outside in the radial direction.

  The slider 23 is sandwiched between the sliding surface 24 and the inner surface of the recess 29. The slider 23 is formed in a hemispherical shape that protrudes upward. The upper surface of the slider 23 is formed in a convex spherical shape that is convex upward. The curvature of the surface of the slider 23 is equivalent to the curvature of the inner surface of the recess 29. The slider 23 is disposed coaxially with the axis O, and is fitted in the recess 29 of the housing 28. Since the slider 23 is fitted in the recess 29, the horizontal movement of the slider 23 relative to the upper collar 22 is restricted.

The slider 23 protrudes downward from the inside of the recess 29. An end surface of the slider 23 facing downward is in contact with the sliding surface 24 so as to be slidable in the horizontal direction.
The slider 23 can be brought into contact with the auxiliary stopper 25 from the inner side in the horizontal direction. In the present embodiment, a portion of the slider 23 that protrudes downward from the recess 29 (hereinafter referred to as “protruding portion”) can contact the auxiliary stopper 25 from the inside in the radial direction. The auxiliary stopper 25 surrounds the protruding portion of the slider 23 over the entire circumference from the outside in the horizontal direction.

In the present embodiment, the sliding bearing 20 is provided with a stopper 31 (a stopper for sliding bearing). The stopper 31 is provided on the lower collar 21 in common with the auxiliary stopper 25.
The stopper 31 is detachably connected to the lower collar 21. The stopper 31 includes a ring material 32 and a connection portion 33. For example, the ring material 32 and the connection portion 33 can be integrally formed of the same material.

  The ring member 32 surrounds the upper collar 22 (the lower collar or the upper collar contacting the stopper when the lower collar and the upper collar are relatively displaced in the horizontal direction) from the outside in the horizontal direction over the entire circumference. As shown in FIG. 4, the ring member 32 is formed in an annular shape and is arranged coaxially with the axis O. The ring material 32 is formed to have a larger diameter than the upper collar 22.

  The connecting portion 33 connects the ring material 32 and the lower collar 21. The connecting portion 33 includes a plurality of rib members 34 arranged at intervals in the circumferential direction. The plurality of rib members 34 are arranged radially about the axis O in the top view. An even number of rib members 34 are provided in the circumferential direction, six in the illustrated example. The plurality of rib members 34 are arranged at equal intervals in the circumferential direction. Each rib member 34 is shifted in the circumferential direction with respect to the flange portion 26 of the lower collar 21, and the rib member 34 and the flange portion 26 are not overlapped in the vertical direction.

  The plurality of rib members 34 have the same shape and the same size. The rib member 34 extends linearly in the radial direction. The rib member 34 is formed in a plate shape whose front and back surfaces are directed in the vertical direction. The size of the rib member 34 in the circumferential direction is the largest at both ends in the radial direction of the rib member 34 and gradually decreases toward the intermediate portion of the rib member 34 in the radial direction. The rib member 34 is recessed from both sides in the circumferential direction toward the inside in the circumferential direction in the top view.

  The outer end portion located on the radially outer side of the rib member 34 is fixed to the ring member 32 by, for example, welding. An inner end portion located on the radially inner side in the rib member 34 is fixed to the lower collar 21. As shown in FIG. 5, the inner end portion is fixed to the lower collar 21 via a fixing plate 35. The fixing plate 35 protrudes from the inner end portion of the rib member 34 along the outer peripheral surface of the lower collar 21. The fixing plate 35 is detachably fixed to the lower collar 21 by a first bolt 36. The first bolt 36 is inserted into the fixed plate 35 from the outside in the radial direction.

As shown in FIG. 2, the ring material 32 is divided into a plurality of pieces in the circumferential direction. The dividing surface 37 that divides the ring material 32 is shifted in the circumferential direction with respect to the portion of the ring material 32 that is connected to the rib material 34. Two division surfaces 37 are arranged at intervals in the circumferential direction, and the ring member 32 is divided into two ring division bodies 38 in the circumferential direction. End portions in the circumferential direction of the two ring divided bodies 38 are fixed by a second bolt 39 so as to be disassembled. The ends of the ring divided body 38 are overlapped in the radial direction, and the second bolt 39 is inserted into the ends from the outside in the radial direction.
The ring material 32 and the rib material 34 are formed of, for example, an SM material, an SN material, a LYP material, or the like. The ring material 32 can be formed by bending, for example, an SM material, an SN material, or a LYP material.

  Next, the operation of the bridge 10 and the sliding bearing 20 will be described.

  As shown in FIG. 6, when an earthquake occurs and vibration is applied to the bridge 10, the lower structure 11 and the upper structure 12 vibrate in a horizontal direction such as the orthogonal direction. Then, as shown in FIG. 7, the slider 23 slides on the sliding surface 24 in the horizontal direction with the relative displacement of the lower rod 21 and the upper rod 22 in the horizontal direction. At this time, the slider 23 swings around the center of curvature of the sliding surface 24 while sliding on the sliding surface 24 in the horizontal direction. At this time, the surface of the slider 23 slides on the inner surface of the recess 29 around the center of curvature of the surface of the slider 23.

  Here, when the expected vibration occurs and the lower rod 21 and the upper rod 22 are relatively displaced in the horizontal direction, the slider 23 slides on the sliding surface 24 as described above, and the seismic isolation performance is exhibited. . That is, the vibration energy is absorbed and the vibration is attenuated by the friction generated when the slider 23 slides on the sliding surface 24. At this time, the sliding bearing 20 functions as a so-called spherical friction pendulum type seismic isolation bearing.

On the other hand, when unexpectedly large vibrations occur, as shown in FIG. 7, the slider 23 slides on the sliding surface 24, and the lower rod 21 and the upper rod 22 are relatively displaced in the horizontal direction. The stopper 31 contacts 22 from the outside in the horizontal direction. Thereby, the further relative displacement of the lower rod 21 and the upper rod 22 is controlled.
By the way, when unexpectedly large vibrations occur in this way, even if the stopper 31 restricts the horizontal relative displacement between the lower collar 21 and the upper collar 22, the lower collar 21 and the upper collar 22 There is a possibility that the relative displacement is forced in the horizontal direction. In this case, the slider 23 further slides on the sliding surface 24 while the upper collar 22 plastically deforms the stopper 31 in the horizontal direction.

At this time, as shown in FIG. 8, the auxiliary stopper 25 comes into contact with the slider 23 from the outside in the horizontal direction, and further sliding on the sliding surface 24 of the slider 23 is restricted. Thereby, the auxiliary stopper 25 restricts the forcible horizontal displacement of the lower rod 21 and the upper rod 22 via the slider 23 and the housing 28.
As described above, the vibration energy is also absorbed when the stopper 31 and the auxiliary stopper 25 restrict the horizontal displacement of the lower rod 21 and the upper rod 22 in the horizontal direction. Therefore, the sliding bearing 20 can absorb vibration energy in three stages. The three stages are the sliding of the slider 23 on the sliding surface 24, the restriction by the stopper 31 of the relative displacement between the lower collar 21 and the upper collar 22, and the auxiliary stopper of the relative displacement between the lower collar 21 and the upper collar 22. 25 levels.

  Here, a simulation analysis was performed on the sliding bearing 20 as shown in FIGS. The load displacement history loop shown in FIG. 9 is when the horizontal relative displacement between the lower rod 21 and the upper rod 22 is sufficiently restricted by the stopper 31, and the slider 23 and the auxiliary stopper 25 are not in contact with each other. Is. The load displacement history loop shown in FIG. 10 is a case where the horizontal relative displacement between the lower rod 21 and the upper rod 22 is not sufficiently restricted by the stopper 31, and both the stopper 31 and the auxiliary stopper 25 are This is a case where the relative displacement in the horizontal direction between 21 and the upper collar 22 is restricted.

As shown in FIG. 9, while the absolute value of the horizontal displacement, which is the amount of relative displacement between the lower collar 21 and the upper collar 22, is small, as the horizontal displacement increases, the lower collar 21 and the upper collar 22 The horizontal reaction force, which is a load for displacing the, is increased. From this, it can be seen that the vibration damping effect by the slider 23 is exerted (in the range of the alternate long and short dash line A in FIG. 9).
Further, when the absolute value of the horizontal displacement increases, the increase of the horizontal displacement amount is restricted, and the horizontal reaction force increases rapidly. From this, it can be seen that the horizontal relative displacement between the lower rod 21 and the upper rod 22 is regulated by the stopper 31, and further, the vibration damping effect is exhibited by the plastic deformation of the stopper 31 (one point in FIG. 9). Range of chain line B).
As shown in FIG. 10, when the absolute value of the horizontal displacement is further increased, the increase in the horizontal displacement amount is further restricted, and the horizontal reaction force is increased more rapidly. From this, it is understood that the horizontal relative displacement between the lower rod 21 and the upper rod 22 is restricted by the auxiliary stopper 25, and further, the vibration damping effect is exhibited by the plastic deformation of the auxiliary stopper 25 (in FIG. 10). , Range of alternate long and short dash line C).

  As described above, according to the bridge 10, the sliding bearing 20, and the stopper 31 according to this embodiment, the relative displacement in the horizontal direction between the lower rod 21 and the upper rod 22 when unexpectedly large vibration occurs. Can be controlled to be constant by the stopper 31. Therefore, it becomes possible to add a fail-safe function to the sliding bearing 20, and while suppressing excessive relative displacement along the horizontal direction between the lower structure 11 and the upper structure 12, an increase in size of the sliding bearing 20 is suppressed. The structure can be simplified.

Further, when the stopper 31 restricts the relative displacement of the lower rod 21 and the upper rod 22 along the horizontal direction, the stopper 31 contacts the upper rod 22 from the outside in the horizontal direction. Therefore, the stopper 31 can directly regulate the displacement of the upper collar 22 in the horizontal direction, and the relative displacement between the lower collar 21 and the upper collar 22 can be effectively regulated.
In addition, by attaching the stopper 31 to the existing sliding bearing 20, the above-described effects can be achieved even in a seismically isolated structure that has been constructed.

  Further, the auxiliary stopper 25 can restrict the relative displacement of the lower rod 21 and the upper rod 22 in the horizontal direction. Therefore, excessive relative displacement along the horizontal direction between the lower structure 11 and the upper structure 12 can be reliably regulated.

  Further, since both the stopper 31 and the auxiliary stopper 25 are provided in common with the lower rod 21, the stopper 31 and the auxiliary stopper 25 are integrated into the lower rod 21, and the structure of the upper rod 22 is simplified. Can do. Therefore, the structure of the entire sliding bearing 20 can be easily simplified.

  Further, since the stopper 31 includes the ring material 32, the lower rod 21 and the upper rod 22 are separated by the ring material 32 regardless of the direction in which the lower rod 21 and the upper rod 22 are relatively displaced along the horizontal direction. Relative displacement can be regulated. Therefore, the sliding bearing 20 can be easily applied in various ways.

  Moreover, since the connection part 33 is provided with the some rib material 34 arrange | positioned at intervals in the circumferential direction of the ring material 32, the connection part 33 continues continuously over the perimeter of the circumferential direction of the ring material 32, for example. Compared with the case where it extends, the connection part 33 can be reduced in weight. Therefore, for example, the amount of material used to form the connection portion 33 can be suppressed, and the cost of the sliding support 20 can be reliably reduced.

  In addition, since the stopper 31 is detachably connected to the lower collar 21, for example, unexpectedly large vibration occurs, and the stopper 31 is damaged when the stopper 31 is plastically deformed by the upper collar 22. Sometimes, this stopper 31 can be replaced with a new stopper 31 that is not damaged. Therefore, the maintainability of the sliding bearing 20 can be improved.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

In the said embodiment, although the ring material 32 is divided | segmented into multiple in the circumferential direction, this invention is not limited to this. For example, the ring material 32 may be integrally formed over the entire circumference in the circumferential direction.
In the said embodiment, although the connection part 33 is provided with the some rib material 34, this invention is not limited to this. For example, the connection part 33 may be formed in the cyclic | annular form extended over the perimeter of the circumferential direction.

  In the above-described embodiment, the stopper 31 includes the ring member 32 and the connecting portion 33. However, in the present invention, the stopper 31 can be appropriately changed to another configuration in which the stopper 31 is detachably connected to the lower collar 21. It is. For example, a configuration in which the stopper 31 includes only the ring material 32 may be employed. In this case, for example, it is possible to adopt a configuration in which the connection portion 33 is formed integrally with the lower collar 21 and the ring member 32 is detachably coupled to the connection portion 33.

  In the embodiment, the stopper 31 is detachably connected to the lower collar 21, but the stopper 31 may be provided on the lower collar 21 so as not to be removable. The lower rod 21 and the stopper 31 may be welded, or the lower rod 21 and the stopper 31 may be integrally formed. In the case of welding, for example, the stopper 31 can be formed by cutting and welding SM material or SN material. The welded portion in this case may be complete penetration welding. It is also possible to integrally form the lower rod 21 and the stopper 31 with a forged product or a cast product. In the case of a forged product, the lower collar 21 and the stopper 31 can be formed of, for example, an S35CN material. In the case of a cast product, the lower collar 21 and the stopper 31 can be formed of, for example, SCW480 material.

  In the said embodiment, although the stopper 31 is provided with the ring material 32, this invention is not limited to this. For example, in the sliding bearing 20 in which the lower rod 21 and the upper rod 22 are allowed to be relatively displaced in a specific direction in the horizontal direction, the non-restriction in which the relative displacement in the one direction is restricted. A ring-shaped configuration can be employed.

  In the said embodiment, although the stopper 31 is provided in the lower collar 21, this invention is not limited to this. For example, when the stopper 31 is provided on the upper collar 22 and the lower collar 21 and the upper collar 22 are relatively displaced in the horizontal direction, the stopper 31 comes into contact with the lower collar 21 so that the lower collar 21 and the upper collar 22 are further updated. The relative displacement may be regulated. In the present invention, when the lower rod 21 and the upper rod 22 are relatively displaced in the horizontal direction on either one of the lower rod 21 and the upper rod 22, by contacting the other from the outside in the horizontal direction, It can change suitably to the other structure to which the stopper 31 which controls the further relative displacement of the lower collar 21 and the upper collar 22 was connected.

  In the embodiment, the horizontal displacement of the upper collar 22 with respect to the slider 23 is restricted and the sliding surface 24 is provided on the lower collar 21, but the present invention is not limited to this. For example, the sliding surface 24 may be provided on the upper collar 22, and the relative displacement of the lower collar 21 with respect to the slider 23 in the horizontal direction may be restricted. In the present invention, the relative displacement in the horizontal direction with respect to one of the sliders 23 of the lower rod 21 and the upper rod 22 is restricted, and the configuration is appropriately changed to another configuration in which the sliding surface 24 is provided on either one. be able to.

In the above embodiment, both the stopper 31 and the auxiliary stopper 25 are provided in common with the lower collar 21, but the present invention is not limited to this. For example, both the stopper 31 and the auxiliary stopper 25 may be provided in common on the upper collar 22. Further, the stopper 31 may be provided on the upper collar 22, and the auxiliary stopper 25 may be provided on the lower collar 21. In the configuration in which the stopper 31 is provided on the upper collar 22, the horizontal displacement of the lower collar 21 and the upper collar 22 can be restricted by the stopper 31 coming into contact with the lower collar 21.
In the present invention, the auxiliary stopper 25 may not be provided.

  In the embodiment, the relative displacement in the horizontal direction with respect to the slider 23 of either the lower rod 21 or the upper rod 22 is restricted, and the sliding surface 24 is provided on the other, but the present invention It is not limited to this. For example, a so-called double pendulum structure in which the slide surface 24 is provided on both the lower rod 21 and the upper rod 22 may be used.

  In the embodiment, the spherical friction pendulum type seismic isolation bearing is shown as the sliding bearing 20, but the present invention can be applied to other sliding bearings 20.

  In the embodiment, the structure, shape, material, and the like of the lower structure 11 and the upper structure 12 are not limited at all. For example, the present invention can be applied to a configuration in which a steel pipe is used for the pier 13 as the bridge 10.

  In the above-described embodiment, an example in which the present invention is applied to the bridge 10 has been described. It is also possible to apply.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

10 Bridge (Seismic isolation structure)
11 Lower structure 12 Upper structure 20 Sliding bearing 21 Lower collar 22 Upper collar 23 Slider 24 Sliding surface 25 Auxiliary stopper 31 Stopper 32 Ring material 33 Connection part 34 Rib material

Claims (4)

An underarm fixed to the substructure,
An upper arm fixed to the upper structure and disposed so as to be relatively displaceable in a horizontal direction with respect to the lower arm;
A slider located between the lower heel and the upper heel, and provided on a sliding surface provided on at least one of the lower heel and the upper heel, and a slider slidably disposed in a horizontal direction,
The slider is a sliding bearing that slides in a horizontal direction on the sliding surface in accordance with a relative displacement in a horizontal direction between the lower collar and the upper collar.
One of the lower heel and the upper heel is brought into contact with the other from the outside in the horizontal direction when the lower heel and the upper heel are relatively displaced in the horizontal direction. And a stopper for restricting further relative displacement between the upper collar and the upper collar ,
The relative displacement in the horizontal direction with respect to the slider of any one of the lower rod and the upper rod is restricted, and either the sliding surface and the auxiliary that can come into contact with the slider from the outside in the horizontal direction A stopper, and
When the stopper that restricts relative displacement between the lower collar and the upper collar is plastically deformed in the horizontal direction by the lower collar or the upper collar, the auxiliary stopper comes into contact with the slider, Further sliding on the sliding surface of the slider is restricted,
The sliding bearing according to claim 1 , wherein both the stopper and the auxiliary stopper are provided in common to the lower collar or the upper collar . An underarm fixed to the substructure,
An upper arm fixed to the upper structure and disposed so as to be relatively displaceable in a horizontal direction with respect to the lower arm;
A slider located between the lower heel and the upper heel, and provided on a sliding surface provided on at least one of the lower heel and the upper heel, and a slider slidably disposed in a horizontal direction,
The slider is a sliding bearing that slides in a horizontal direction on the sliding surface in accordance with a relative displacement in a horizontal direction between the lower collar and the upper collar.
One of the lower heel and the upper heel is brought into contact with the other from the outside in the horizontal direction when the lower heel and the upper heel are relatively displaced in the horizontal direction. And a stopper for restricting further relative displacement between the upper collar and the upper collar ,
The stopper includes a ring member that surrounds the lower collar or the upper collar that contacts the stopper when the lower collar and the upper collar are relatively displaced in the horizontal direction from the outside in the horizontal direction over the entire circumference,
The ring material is connected to the lower collar or the upper collar to which the stopper is coupled via a connecting portion,
The sliding support according to claim 1, wherein the connecting portion includes a plurality of rib members arranged at intervals in the circumferential direction of the ring material . An underarm fixed to the substructure,
An upper arm fixed to the upper structure and disposed so as to be relatively displaceable in a horizontal direction with respect to the lower arm;
A slider located between the lower heel and the upper heel, and provided on a sliding surface provided on at least one of the lower heel and the upper heel, and a slider slidably disposed in a horizontal direction,
The slider is a sliding bearing that slides in a horizontal direction on the sliding surface in accordance with a relative displacement in a horizontal direction between the lower collar and the upper collar.
One of the lower heel and the upper heel is brought into contact with the other from the outside in the horizontal direction when the lower heel and the upper heel are relatively displaced in the horizontal direction. And a stopper for restricting further relative displacement between the upper collar and the upper collar ,
The sliding bearing according to claim 1, wherein the stopper is detachably connected to the lower collar or the upper collar to which the stopper is coupled . Superstructure and substructure,
A seismic isolation structure comprising: the sliding bearing according to any one of claims 1 to 3 disposed between the upper structure and the lower structure.

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