JP2017014748A - Movement restraint device for bearing - Google Patents

Abstract

[PROBLEMS] To reliably restrain movement of a bearing, and even when installed on each of a plurality of bearings, the movement of a plurality of bearings is restrained integrally without being damaged by contact due to the movement of a specific bearing. Provided is a movement restraint device for a bearing capable of supporting. A support movement restraint device 3 installed at a predetermined distance from a side surface of a bridge support 2, comprising a base 31 fixed to the bridge pier 1 and facing the base toward the side of the support. And a die 32 having a cylindrical hollow portion that is open, and a rod 33 fitted so as to protrude toward the side surface of the support in the cylindrical hollow portion of the die. When a part contacts the rod, the movement of the bearing is restricted by the frictional resistance between the die and the rod. [Selection] Figure 1

Description

  The present invention relates to a movement restraining device for a bearing used in a bridge.

  Conventionally, a rubber bearing is known as a bearing having a seismic isolation function in a bridge having a structure that is supported by a pier via the bearing. This rubber bearing has a structure that deforms and moves to absorb expansion and contraction and seismic motion due to temperature changes in the superstructure of the bridge.

  In addition, this rubber bearing is a stopper called a side block that restrains the rubber bearing from moving more than a certain distance from the side of the rubber bearing to prevent the bridge girder from moving more than expected. Is provided. Usually, when the expected rubber bearing moves, a part of the rubber bearing comes into contact with the side block and the movement of the rubber bearing is restricted.

  However, if the bridge girder moves more than expected due to large earthquake motion, etc., if the side block restrains the movement of the rubber bearing, the energy applied to the side block loses its escape and the side block breaks or damages the lower structure such as the pier. There was a case to give.

  In order to solve such a problem, there has been proposed a side block fixing structure that restricts the movement of the rubber bearing and opens the movement restriction of the side block itself (see, for example, Patent Document 1).

  In the fixing structure of the side block of this patent document 1, the perforation of the mounting bolt of the side block, which is the first means, is made into a long hole so that only horizontal movement is possible, and the horizontal force is achieved by the shear key, which is the second means. The movement restriction of the side block itself is released by causing it to resist and break.

  However, the mechanism that controls the movement of the side block is the size of the hole in the hole and the tightening strength of the mounting bolt. All of these configurations are provided at the connection between the side block and the base plate, that is, at the bottom of the base plate. Yes. In such a structure, when a part of the rubber support comes into contact with a high position of the side block, the contact part with a part of the rubber support serves as a power point, and the fastening part of the mounting bolt serves as a fulcrum. Therefore, the lower edge of the base plate becomes a point of action where a downward force is applied, and the side block may not slide properly.

  In addition, this side block fixing structure has a problem that the mechanism for controlling the movement restriction of the side block is a shear key, and if there is a construction error of the base plate, the movement of multiple supports cannot be constrained integrally. It was.

  On the other hand, in a normal bridge, a plurality of rubber bearings may be arranged on one bearing line in order to disperse energy such as earthquake motion. When installing side blocks on multiple rubber bearings arranged on a single bearing line, the rubber bearings and side blocks may vary depending on the manufacturing accuracy of the rubber bearing body and side block and the error in the installation position of the side block. It is extremely difficult to make the gap between the two uniform. In addition, when installing side blocks, due to drilling errors between the side block and base plate mounting bolts, all mounting bolts do not bear the load equally, and the load may be biased to specific bolts with a small gap in the hole. .

JP 2007-297792 A

  In such a situation, the side blocks abut against the rubber bearings on one bearing line at different timings, so that the integral rubber bearing restraint does not function for a plurality of side blocks. If all loads act on the side blocks in contact with each other in advance, all the side blocks may eventually be damaged, and further, the bridge itself may be seriously damaged.

  Further, even when the side block fixing structure of Patent Document 1 is adopted for each rubber bearing on the one bearing line as described above, the side block that comes into contact first does not release the movement restriction appropriately. Moreover, when the function as a side block cannot be expressed appropriately, said problem cannot be solved.

  The present invention has been made in view of the circumstances as described above, and reliably restrains the movement of the bearing, and even when installed on each of the plurality of bearings, the bearing is damaged by the abutment caused by the movement of the specific bearing. However, an object of the present invention is to provide a movement restraining device for a bearing that can integrally restrain movement of a plurality of bearings.

  The movement restraining device for a bearing according to the present invention has been made in order to solve the above technical problem, and is characterized by the following.

  1stly, the movement restraint apparatus of the support of this invention is a movement restraint apparatus of the support installed in the predetermined distance from the side of the support of a bridge, Comprising: The base fixed to the bridge pier, The said base A cylindrical die installed in the lateral direction of the support, and a rod fitted in the hollow portion of the die so as to protrude in the lateral direction of the support, to move the support Accordingly, when a part of the side surface of the support comes into contact with the rod, the movement of the support is restrained by the frictional resistance between the die and the rod.

  Second, in the movement restraint device for a bearing according to the first aspect of the invention, the movement restraint device may be installed for each of at least two or more of the bearings installed on the lower structure of the bridge. preferable.

  Thirdly, in the bearing movement restraining device of the first or second invention, the bearing is preferably a rubber bearing.

  Fourth, in the movement restraint device for a bearing according to any one of the first to third inventions, the die and the rod are made of any metal selected from iron, copper, aluminum, copper alloy, and aluminum alloy. It is preferable to become.

  Fifth, in the movement restraint device for a bearing according to any one of the first to fourth inventions, the die is preferably press-fitted into the rod.

  According to the present invention, the movement of the bearing can be reliably restrained, and even when installed on a plurality of bearings, the movement of the plurality of bearings is integrated without being damaged by contact due to the movement of a specific bearing. It is possible to provide a movement restraining device for a bearing that can be restrained by the movement.

It is a schematic sectional drawing of the movement restraint apparatus of the bearing of this invention. It is a schematic perspective view of the movement restraint apparatus of the support of this invention. It is the schematic which shows the structure of a rubber bearing. It is a schematic sectional drawing of the structure which provided the rubber sheet and the antifouling sheet | seat in the movement restraint apparatus of the support. (A)-(E) are the schematic plan views which show embodiment of arrangement | positioning of the movement restraint apparatus with respect to a support, (A) is arrangement | positioning of 2 directions facing, (B) is arrangement | positioning of 4 directions, (C) is 3 Directional arrangement, (D) shows a right-angled two-directional arrangement, and (E) shows a one-directional arrangement. (A), (B) is a schematic plan view which shows embodiment of the other arrangement | positioning of the movement restraint apparatus with respect to a support. It is the schematic explaining the operation | movement of a movement restraint apparatus in steps. It is a schematic sectional drawing of the bridge in which two bearings were installed. It is the schematic explaining stepwise the operation | movement of the movement restraint apparatus installed in two support | bearings.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a detailed description of a support movement restraint device according to the present invention with reference to an embodiment for carrying out the invention.

  The movement restraint device for a bearing according to the present invention is a movement restraint device for a bearing that is installed at a predetermined distance from a side surface of a bridge support, and includes a base fixed to a bridge pier and a lateral direction of the support on the base. A die having a cylindrical hollow portion that opens toward the surface, and a columnar rod that is fitted in the cylindrical hollow portion of the die so as to protrude toward the side surface of the support.

  FIG. 1 shows a schematic cross-sectional view of an embodiment of the support movement restraint device of the present invention, and FIG. 2 shows a schematic perspective view.

  The movement restraint device (hereinafter, simply referred to as “movement restraint device”) 3 according to the present invention is based on a side surface of a support 2 installed between a lower structure such as a pier 1 in a bridge and an upper structure such as a bridge girder. It is installed at a specific distance.

  The support 2 to which the movement restraint device of the present invention can be applied is a support having a seismic isolation function by moving the upper part of the support 2, and examples thereof include a rubber support, a rolling support, and a sliding support. Among these, application to rubber bearings is preferable. Examples of the rubber bearing include a rubber bearing using a natural rubber-based laminated rubber having a stable spring performance, a high-damping laminated rubber having a damping function, a laminated rubber containing a lead plug, and the like.

  FIG. 3 shows a schematic diagram of the structure of the rubber bearing 2. The rubber bearing 2 is normally installed on the base plate 20 fixed on the pier 1 with anchor bolts 26 in the order of the lower rod 21, the laminated rubber member 22, and the upper rod 23. Further, a shear key 24 is provided between the upper collar 23 and the laminated rubber member 22 and between the lower collar 21 and the laminated rubber member 22 to partially restrict the movement in the horizontal direction. And the upper structure of a bridge is installed on the upper collar 23 via a flange, a web, or the like. With such a structure, when a force is applied in the horizontal direction with respect to the upper part of the bridge due to a seismic motion or the like, the seismic motion can be attenuated by the elasticity of the rubber bearing 2.

  The movement restraining device 3 according to the present embodiment includes a base 31, a die 32, and a rod 33. The base 31 is fixed to the base plate 20 at a specific distance from the support 2 so as not to move. The material of the base 31 is not particularly limited as long as it does not easily collapse, and usually includes concrete, steel, resin, and the like.

  The die 32 is formed in a cylindrical body having a hollow portion, and is installed on the upper portion of the base 31 so that the hollow portion of the cylindrical body opens toward the side surface of the support 2. The die 32 can be installed by being installed on the upper part of the base 31 or can be installed in advance on another support member and the support member can be installed on the upper part of the base 31 by bolts. Moreover, although the die | dye 32 uses the cylindrical body penetrated normally, the thing opposite to the side opened toward the side surface of the support 2 may be obstruct | occluded. The material of the die 32 is not particularly limited, but it is necessary that the material be strong enough to support the rod 33 described later with frictional resistance. Examples of such materials include steel materials such as iron, copper, aluminum, copper alloys, and various alloys such as aluminum alloys, resins, and the like.

  In addition, in the present invention, the meaning of the cylindrical body of the die 32 includes a shape of the opening that is circular, elliptical, polygonal, and other various shapes.

  The rod 33 is a columnar member that abuts a part of the support 2 when the support 2 moves and restrains the movement of the support 2. The rod 33 is formed in the hollow portion of the cylindrical body of the die 32. It is press-fitted and fitted so as to protrude toward the side surface. The material of the rod 33 is not particularly limited, and for example, steel materials such as iron, copper, aluminum, copper alloys, and various alloys such as aluminum alloys, resins, and the like can be used.

  Further, the frictional resistance force of the rod 33 against the die 32 can be set according to the moving distance of the support 2 and the target restraining force, and is not particularly defined, but is normally supported by a ground motion of a predetermined level or less. In the contact of 2, the rod 33 does not move, and it is preferable to set the frictional resistance force that the rod 33 moves by the earthquake motion exceeding a predetermined level.

  Furthermore, the frictional resistance force of the rod 33 against the die 32 is set to a frictional resistance force that can sufficiently absorb the energy of the earthquake motion as thermal energy until the pier reaches the yield level when the earthquake motion exceeds a predetermined level. preferable.

  The predetermined level of ground motion in the present invention is a level of ground motion that has a high probability of occurring during the service period of the target bridge and does not yield the bridge. The seismic strength of each bridge varies depending on the type of bridge, the height of pier 1, topography, geology, ground conditions, etc., and the level at which the bridge does not yield varies accordingly. For example, it refers to the level of earthquake motion in the Great East Japan Earthquake class.

  The set value of frictional resistance is that the seismic motion energy is gradually absorbed as thermal energy as the multiple bearings sequentially come into contact with the movement restraint device, and finally the retained horizontal strength of the pier (the pier is plastic) It is preferable to obtain the number of the movement restraining devices and the respective frictional resistances by analyzing them by static analysis so that they fall within the proof strength that can be achieved. In addition, when installing a plurality of movement restraint apparatuses, each frictional resistance may be different depending on the installation state.

  As described above, the frictional resistance is set by adjusting the contact pressure between the die 32 and the rod 33, the surface state of the contact portion between the die 32 and the rod 33, the press-fitting condition of the rod 33 with respect to the die 32, and the like. It can be set appropriately.

  Further, the protruding length of the rod 33 from the die 32, that is, the stroke length of the rod 33 can be appropriately set according to the scale of the bridge and the allowable movement amount of the bearing. Usually, the protruding direction of the rod 33 is determined. When installing in the bridge axis direction (SE x 0.75) mm or less (SE: required girder length (mm)), when installing the protruding direction of the rod 33 in the direction perpendicular to the bridge axis, 25 to 75 mm, Preferably about 50 mm is considered. In addition, the movement restraint apparatus 3 can be made into a fall-bridge prevention structure by making the stroke length of the rod 33 when installing the protrusion direction of the rod 33 into a bridge axis direction into the said range.

  Further, in the present embodiment, as shown in FIG. 4, a rubber cover 34 is provided at the tip portion where the rod 33 protrudes from the die 32 so that the frictional resistance between the rod 33 and the die 32 does not change with time. Can do. Further, the antifouling cover 35 can be provided on the surface opposite to the surface from which the rod 33 protrudes from the die 32.

  The movement restraint device 3 of the present invention may be installed at any position with respect to the bridge as long as it is installed at a specific distance with respect to the side surface of the support 2. Specifically, for example, as shown in FIG. 5 (A), the arrangement is in two directions across the support 2, or the four-direction arrangement shown in FIG. 5 (B), the three-direction arrangement shown in FIG. 5 (C). 5D, a two-directional arrangement shown in FIG. 5D, and a one-directional arrangement shown in FIG. 5E.

  The specific distance (interval) between the support 2 and the rod 33 when installed on the side surface of the support 2 should be appropriately set according to the movement distance allowed in the performance of the support 2 and the scale and shape of the bridge. Can do.

  As another embodiment of the arrangement of the movement restraining device 3 with respect to the support 2, as shown in FIG. 6A, one side surface of the upper collar 23 of the support 2 is extended and the extended upper collar 23 is extended. The rod 33 can also be disposed with the tip end directed. With such an arrangement, the arrangement space for the movement restraining device 3 can be saved. Further, as shown in FIG. 6 (B), the two side surfaces of the upper collar 23 of the support 2 are extended in a reverse concave shape, and the rod 33 is disposed in the space so as to protrude from both sides of the die 32. Accordingly, it is possible to function as a friction damper capable of restraining the movement of the support 2 against reciprocal earthquake motion.

  According to the movement restraint device 3 of the present embodiment, when the support 2 moves with the occurrence of a seismic motion of a predetermined level or more, a part of the support 2 comes into contact with the tip of the rod 33 and the rod 33 slides. The vibration energy of the rod 33 with respect to the die 32 is converted into heat energy by absorbing friction of the rod 33 to absorb the movement energy of the support 2. The movement of the support 2 can be restricted by these series of operations.

  The movement restraining device 3 restrains the movement of the support 2 by the above mechanism, but it is important to install the movement restraining device 3 so that a specific part of the moved support 2 is in contact with the rod 33 with certainty. is there. As such an installation position, it is preferable to install so that the tip of the rod 33 contacts the side surface of the upper rod 23 where the horizontal movement amount of the support 2 is maximized.

  In order to accurately match the height of the upper rod 23 and the rod 33, the height of the base 31 is designed to match the height, or a height adjusting plate is interposed between the pier 1 and the base 31. Can be performed.

  Below, operation | movement of the movement restraint apparatus 3 of this embodiment is demonstrated. FIG. 7 is a schematic diagram illustrating the operation of the movement restraining device 3 of the present embodiment step by step. A schematic sectional view showing the state of the support 2 and the movement restraining device 3 is shown on the left side of FIG. 7, and a graph showing the relationship between the force applied to the rod and its displacement is shown on the right side.

  (S1-1) in FIG. 7 shows a normal state where there is no occurrence of earthquake motion or the like and the support 2 is not moving. In this state, the upper collar 23 of the support 2 and the rod 33 are not in contact.

  Next, (S1-2) is a state immediately after the occurrence of a seismic motion of a predetermined level or higher, and shows a state where the upper collar 23 of the support 2 is in contact with the rod 33. In this state, the rod 33 moves a little by the contact of the upper collar 23 to absorb the movement energy of the support 2.

  (S <b> 1-3) is a state in which the support 2 is greatly deformed and moved by an earthquake motion of a predetermined level or more, and the upper rod 23 is in strong contact with the rod 33. In this state, the rod 33 is moved greatly by the contact of the upper collar 23 to absorb the movement energy of the support 2.

  This can be seen from the graph that when a certain force or more is applied to the rod, the rod is displaced and the load exceeding the certain value does not increase and is absorbed.

  By such an operation of the movement restraining device 3, it is possible to reliably restrain the movement of the support 2 without damaging the movement restraining device 3 due to the contact of the support 2 or the lower structure of the bridge.

  On the other hand, in a normal bridge, as shown in FIG. 8, a plurality of supports 2 are arranged on a pier 1 on one support line in order to disperse energy such as earthquake motion. The movement restraint device of the present invention can be installed on each of at least two bearings 2 arranged on one bearing line.

  Below, operation | movement of the movement restraint apparatus 3 of this embodiment is demonstrated. FIG. 9 is a schematic diagram illustrating step by step the respective operations when the movement restraining devices 3 and 3 ′ of the present embodiment are installed on the two supports 2 (A) and 2 ′ (B) shown in FIG. 8. FIG. A schematic sectional view showing the state of the support 2 (A), the support 2 ′ (B) and the movement restraining devices 3, 3 ′ is shown on the left side of FIG. A graph of the relationship between such force and its displacement is shown.

  Note that the bearing 2 (A) and the bearing 2 ′ (B) in FIG. 9 are the timing of contact of the upper collar 23 with the rod 33 of the movement restraining device 3 installed on the bearing 2 (A) and the bearing 2 ′. (B) The case where the timing of contact | abutting of upper collar 23 'with respect to rod 33' of the movement restraint apparatus 3 'installed in (B) differs is assumed.

  (S2-1) in FIG. 9 shows a normal state where there is no occurrence of seismic motion or the like and neither the support 2 (A) nor the support 2 '(B) is moving. In this state, the upper collar 23 and the rod 33 of the support 2 (A) and the upper collar 23 'and the rod 33' of the support 2 '(B) are not in contact with each other.

  Next, (S2-2) is a state immediately after the occurrence of a ground motion of a predetermined level or more. The upper collar 23 of the bearing 2 (A) abuts the rod 33, and the upper collar 23 'of the bearing 2' (B) The state which is not contact | abutting to rod 33 'is shown. In this state, the rod 33 is slightly moved by the contact of the upper flange 23 of the support 2 (A) to absorb the movement energy of the support.

  In (S2-3), the bearing is greatly deformed and moved by an earthquake motion of a predetermined level or more, and the upper collar 23 of the bearing 2 (A) strongly contacts the rod 33, and the upper collar 23 'of the bearing 2' (B) In this state, the rod 33 ′ is in weak contact. In this state, the rod 33 moves greatly by the abutment of the upper collar 23 of the support 2 (A) to absorb the movement energy of the bearing, and at the same time, the rod 33 'is abutted by the abutment of the upper collar 23' of the support 2 '(B). Moves a little and absorbs the kinetic energy of the bearing. That is, the large movement of the support 2 (A) is constrained first, and then the movement of the support 2 '(B) is constrained simultaneously.

  Even when the movement restraint device according to the present invention is installed on a plurality of bearings as described above, the movement restraint device or the lower structure of the bridge by the contact of a specific bearing by the operation of each movement restraint device. It is possible to constrain the movement of the plurality of supports integrally without damaging the base plate.

  As mentioned above, although the movement restraint apparatus of this invention was demonstrated based on embodiment, the movement restraint apparatus of this invention is not limited to said embodiment, A various change is possible within the range which does not deviate from the summary. It is.

  For example, in the above embodiment, only the movement restraining device 3 is installed for one support 2, but other side blocks, dampers, and the like can be used in combination.

  Further, a part or all of the existing side blocks can be replaced with the movement restraining device 3 and installed.

DESCRIPTION OF SYMBOLS 1 Bridge pier 2 Support 20 Base plate 21 Lower collar 22 Laminated rubber member 23 Upper collar 24 Shear key 25 Bolt 26 Anchor bolt 3 Bearing movement restraint device 31 Base 32 Die 33 Rod 34 Rubber cover 35 Antifouling cover 4 Flange 5 Web

Claims (5)

A movement restraint device for a bearing installed at a predetermined distance from the side of the bridge bearing,
A base fixed to the pier,
A cylindrical die installed on the base in the lateral direction of the support;
A rod fitted to the hollow portion of the die so as to protrude toward the side surface of the support;
A movement restraint device for a bearing that restrains the movement of the bearing by frictional resistance between the die and the rod when a part of the side surface of the bearing comes into contact with the rod as the bearing moves. .   The movement restraint device for a bearing according to claim 1, wherein the movement restraint device is installed for each of at least two of the bearings installed on a pier.   The movement restraint device for a bearing according to claim 1, wherein the bearing is a rubber bearing.   The movement restriction of the bearing according to any one of claims 1 to 3, wherein the die and the rod are made of any metal selected from iron, copper, aluminum, copper alloy, and aluminum alloy. apparatus. The movement restricting device for a bearing according to any one of claims 1 to 4, wherein the die is press-fitted into the rod.