Bridge earthquake reinforcement devices

Abstract

To provide an earthquake strengthening device for bridge having a horizontal force sharing function and a step prevention function that can be installed in a small space.SOLUTION: An earthquake strengthening device for bridge added between a lower structure and an upper structure of an existing bridge to reinforce earthquake performance, includes a first member 2 having a protrusion 22 and a second member 3 having a recess 31. A horizontal force sharing function is provided by loosely fitting the protrusion 22 and the recess 31 to form a shear key by connecting and supporting the first member 2 to one of the lower structure and the upper structure and connecting and supporting the second member 3 to the other of them. A step prevention function is provided by interposing a spacer 6 having a prescribed thickness between the first member 2 and the second member 3, or between the lower structure or the upper structure and the earthquake strengthening device to suppress the falling of the upper structure and reduce the step therebetween.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an earthquake-resistant reinforcement device for a bridge, and more particularly to an earthquake-resistant reinforcement device for a bridge that combines a horizontal force sharing function and a step prevention function. [Background technology]

[0002] Previously, seismic reinforcement measures to reinforce existing bearings designed as Type A as specified in the 2002 Highway Bridge Specifications so that they could withstand Level 2 earthquake motion required the additional installation of horizontal force sharing structures and step prevention structures.

[0003] The horizontal force distribution structure is a seismic reinforcement structure (device) for existing supports that is required from the viewpoint of ensuring safety against bridge collapse. However, in recent seismic reinforcement of existing supports, the bearing height is high, and in order to allow emergency vehicles to pass even if the horizontal force distribution structure is destroyed by an earthquake force of level 2 or more, a step prevention structure is required to be installed separately in addition to the horizontal force distribution structure (see the 2012 Road Bridge Specifications, the Ministry of Land, Infrastructure, Transport and Tourism Road Bureau Administrative Notice of December 18, 2012, and the Ministry of Land, Infrastructure, Transport and Tourism Road Bureau Administrative Notice of June 25, 2015). In other words, the step prevention structure is required to at least ensure the function of the support structure as an evacuation route and a route for rescue, emergency, medical, firefighting activities, and transportation of emergency supplies against an earthquake force of level 2 or more.

[0004] As an example of a horizontal force sharing structure, Patent Document 1 discloses a stopper device for limiting displacement of a structure that is responsive to upward lifting forces. The stopper device for limiting displacement of a structure that is resistant to upward lifting forces and described in Patent Document 1 is a device that is installed between a lower structure 6 equipped with a support and an upper structure 7 above it, a first stopper member 1 fixed to the lower structure 6 is provided with an upward locking protrusion 2, a second stopper member 3 fixed to the upper structure 7 is provided with a downward opening recess 4 for locking, the upward protrusion 2 is disposed within the downward opening recess 4, an outward flange 27 that protrudes laterally is provided at the top of the upward locking protrusion 2 on the first stopper member 1 by joining the member by a screw joint, and an inward flange 27 that protrudes inwardly from the downward opening recess 4 for locking at a level lower than the outward flange 28 is provided at the lower end of the second stopper member 3, and the width dimension of the outward flange in the direction perpendicular to the bridge axis is larger than the width dimension between the inner wall faces of the inward flanges (see claim 1 in the Scope of Claims of Patent Document 1, paragraphs

[0009] to

[0031] of the specification, Figures 1 and 2 of the drawings, etc.).

[0005] However, the upward lift-force-compatible stopper device for limiting displacement of a structure described in Patent Document 1 does not have a step prevention function, and it is necessary to provide a separate step prevention structure.

[0006] As a step prevention structure, a step prevention device is disclosed in Patent Document 2. The step prevention device 1 described in Patent Document 2 has a storage section 12 inside and an opening 13 at the top for pouring a filler into the storage section 12, and is equipped with a main body 10 that can be fixed to the top of a pier, and a lid section 20 that closes the opening 13 (see claim 1 in the claims of Patent Document 2, paragraphs

[0015] to

[0022] of the specification, and Figures 1 to 3 of the drawings, etc.).

[0007] However, the step prevention device described in Patent Document 2 does not have a horizontal force sharing function, and it is necessary to provide a horizontal force sharing structure separately.

[0008] As described above, the stopper device for limiting displacement of a structure that is responsive to upward lifting force in Patent Document 1 and the step prevention device described in Patent Document 2 are both devices that are assumed to be installed separately, and if there is no space around the support, the installation of each device requires extending the lower structure with brackets or the like, which increases costs. In addition, there are cases where there is no room to extend the brackets or the like from the lower structure, making it extremely difficult to create space to install these two devices in the first place. Furthermore, even if space can be secured to install the two devices, the area around the support becomes extremely complicated, which can cause problems in maintaining and managing these devices. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2008-115639 A [Patent Document 2] JP 2019-138094 A Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been devised in consideration of the above-mentioned problems, and its object is to provide an earthquake-resistant reinforcement device for bridges that combines horizontal force sharing and step prevention functions and can be installed in a space-saving manner. [Means for solving the problem]

[0011] The bridge seismic reinforcement device according to claim 1 is an earthquake-resistant reinforcement device for bridges that is added between the substructure and superstructure of an existing bridge to reinforce earthquake resistance performance, and includes a first member having a convex portion and a second member having a concave portion, and the first member is connected to and supported by either the substructure or the superstructure, and the second member is connected to and supported by the other of the two, so that the convex portion and the concave portion fit loosely into each other to form a shear key, thereby providing a horizontal force sharing function that resists horizontal forces, and a spacer of a predetermined thickness is interposed between the first member and the second member, or between the substructure or the superstructure and the earthquake-resistant reinforcement device, thereby providing a step prevention function that suppresses the fall of the superstructure and reduces the step between the two. The spacer is located only above the upper end of the protrusion. It is characterized by:

[0012] The bridge earthquake-resistant reinforcement device described in claim 2 is characterized in that, in the bridge earthquake-resistant reinforcement device described in claim 1, the spacer is a cushioning material that contains a rubber elastomer in part or is made entirely of a rubber elastomer.

[0013] The earthquake-resistant reinforcement device for a bridge according to claim 3 is the earthquake-resistant reinforcement device for a bridge according to claim 2, characterized in that the spacer substitutes for a part of the bearing function in the event of an emergency.

[0014] The earthquake-resistant reinforcement device for a bridge according to claim 4 is the earthquake-resistant reinforcement device for a bridge according to any one of claims 1 to 3, characterized in that the spacer is joined to a tip of the convex portion.

[0015] The bridge earthquake-resistant reinforcement device described in claim 5 is characterized in that, in the bridge earthquake-resistant reinforcement device related to claim 4, the first member has a disk-shaped additional flange that covers and is fixed to the upper end of the convex portion, and the spacer is joined to the upper surface of the additional flange.

[0016] The bridge earthquake-resistant reinforcement device described in claim 6 is characterized in that, in the bridge earthquake-resistant reinforcement device described in claim 4, the spacer is mechanically fixed, bonded with an elastic adhesive, or vulcanization-bonded to the upper end surface of the convex portion.

[0017] The bridge earthquake-resistant reinforcement device described in claim 7 is characterized in that, in the bridge earthquake-resistant reinforcement device described in claim 4, it has a second spacer made of a rubber elastic body, the first member is attached via the second spacer, and the second spacer substitutes for part of the bearing function in the event of an emergency.

[0018] The earthquake-resistant reinforcement device for a bridge according to claim 8 is characterized in that, in the earthquake-resistant reinforcement device for a bridge according to claim 7, a core rod is provided that restrains horizontal displacement of the first member.

[0019] The earthquake-resistant reinforcement device for a bridge according to claim 9 is the earthquake-resistant reinforcement device for a bridge according to any one of claims 1 to 8, further comprising an upper adjustment plate according to the gradient of the superstructure.

[0020] The bridge earthquake-resistant reinforcement device described in claim 10 is characterized in that, in the bridge earthquake-resistant reinforcement device related to claim 9, the upper adjustment plate has a recess formed on its underside to prevent interference with the spacer.

[0021] The earthquake-resistant reinforcement device for a bridge according to claim 11 is 5 In the earthquake-resistant reinforcement device for a bridge relating to the above, the first member has a shoulder portion that protrudes outward, and the shoulder portion abuts against the underside of the additional flange with the additional flange abutting against the upper surface of the convex portion. The earthquake-resistant reinforcement device for a bridge according to claim 12 is characterized in that, in the earthquake-resistant reinforcement device for a bridge according to claim 1, a buffer body is fitted onto an outer peripheral surface of the convex portion. In addition, the earthquake-resistant reinforcement device for bridges described in claim 13 is a earthquake-resistant reinforcement device for bridges that is added between the substructure and superstructure of an existing bridge to reinforce its earthquake-resistant performance, and is equipped with a first member having a convex portion and a second member having a concave portion, the first member is connected to and supported by either the substructure or the superstructure, a buffer is fitted onto the outer peripheral surface of the convex portion, and the second member is connected to and supported by the other of the two, whereby the convex portion and the concave portion fit loosely into each other to form a shear key, providing a horizontal force sharing function that resists horizontal forces, and a spacer of a predetermined thickness is interposed between the first member and the second member, or between the substructure or the superstructure and the earthquake-resistant reinforcement device, providing a step prevention function that suppresses the fall of the superstructure and reduces the step between the two. Effect of the Invention

[0022] Claim 1~ 13According to the earthquake-resistant reinforcement device for bridges, the horizontal force distribution function and the step prevention function can be combined, so that the narrow space around the bearing can be effectively utilized and the installation cost can be reduced. 13 According to the above-mentioned bridge seismic reinforcement device, even when there is no space to extend the brackets from the substructure, it is possible to provide a bridge seismic reinforcement device that has both a horizontal force distribution function and a step prevention function. 13 According to the earthquake-resistant reinforcement device for bridges described above, the device can be easily maintained even in the narrow space around the bearings, and any defects can be detected and addressed early.

[0023] In particular, according to the earthquake-resistant reinforcement device for bridges of claims 2 and 3, the spacer is a cushioning material that contains at least a rubber elastic body, so that it has a cushioning effect against the falling of the main girders during an earthquake and the passage of emergency vehicles, reducing the risk of damage to the main girders and substructures, and improving the repairability of the bridge.

[0024] In particular, according to the earthquake-resistant reinforcement device for bridges of claim 4, since the spacer is joined to the upper end of the convex portion, when the first member and the second member operate and move horizontally relative to each other, the spacer does not interfere, and there is no risk that the step prevention function will hinder the horizontal force sharing function.

[0025] In particular, according to the earthquake-resistant reinforcement device for bridges as claimed in claim 5, the shear force of the plate thickness of the additional flange of the cover structure and the dispersion function of the spacer make it possible to support the dead load of the superstructure, thereby achieving a step prevention function.

[0026] In particular, according to the bridge seismic reinforcement device of claim 6, the additional flange and the spacer can be firmly joined. Therefore, the spacer's dispersion function can support the dead load of the superstructure, and the step prevention function can be exerted.

[0027] In particular, according to the earthquake-resistant reinforcement device for bridges recited in claim 7, the second spacer made of a rubber elastic body can take over part of the support function in the event of an emergency and safely support a fallen superstructure.

[0028] In particular, according to the earthquake-resistant reinforcement device for a bridge according to claim 8, the mandrel can restrain the first member from shifting in the horizontal direction.

[0029] In particular, the earthquake-resistant reinforcement device for bridges according to claim 9 can be installed horizontally regardless of the gradient of the superstructure.

[0030] In particular, according to the earthquake-resistant reinforcement device for bridges according to claim 10, the thickness of the spacer and the additional flange can be increased to improve the bearing function in an emergency. Also, according to the earthquake-resistant reinforcement device for bridges according to claim 10, even if the thickness of the spacer and the additional flange is increased, each member of a conventional earthquake-resistant reinforcement device that only has a horizontal force sharing function can be used as it is. Therefore, the manufacturing cost can be reduced.

[0031] In particular, according to the earthquake-resistant reinforcement device for a bridge as recited in claim 11, when the superstructure falls and performs the step prevention function, the threaded portion of the additional flange can be prevented from being damaged by the impact force of the fall by hooking the additional flange at the shoulder portion. [Brief description of the drawings]

[0032] [Figure 1] FIG. 1 is a partially enlarged side view showing a bridge and an earthquake-resistant reinforcement device according to a first embodiment of the present invention, as viewed perpendicular to the bridge axis. [Diagram 2] FIG. 2 is a vertical cross-sectional view of the bridge as viewed in the bridge axis direction, showing the bridge with the seismic reinforcement device and superstructure of the bridge cut vertically. [Diagram 3] FIG. 3 is a vertical cross-sectional view showing the earthquake-resistant reinforcement device for the bridge of the above-mentioned embodiment, cut vertically in the bridge axis direction. [Figure 4] FIG. 4 is a diagram showing only the first member of the earthquake-resistant reinforcement device, where (a) is a front view and (b) is a plan view. [Diagram 5] FIG. 5 is a diagram showing only the second member of the earthquake-resistant reinforcement device, where (a) is a front view, (b) is a plan view, and (c) is a right side view. [Figure 6]FIG. 6 is a perspective view showing only the additional flange of the earthquake-resistant reinforcement device. [Figure 7] FIG. 7 is a perspective view showing only the buffer body of the earthquake-resistant reinforcement device. [Figure 8] FIG. 8(a) is a schematic diagram showing a state in which an unbalanced load acts on the spacer 6 and the additional flange 4 in this embodiment, and FIG. 8(b) is a schematic diagram showing a state in which an unbalanced load acts on a conventional stopper device. [Figure 9] FIG. 9 is a partially enlarged side view showing a modified example of the bridge earthquake-resistant reinforcement device 1 according to the first embodiment of the present invention and the bridge, as viewed in a direction perpendicular to the bridge axis. [Figure 10] FIG. 10 is a vertical cross-sectional view showing a bridge earthquake-resistant reinforcement device according to the second embodiment of the present invention, cut vertically in the bridge axis direction. [Figure 11] FIG. 11 is a perspective view showing only the additional flange of the earthquake-resistant reinforcement device. [Figure 12] FIG. 12 is a vertical cross-sectional view showing a bridge earthquake-resistant reinforcement device according to a third embodiment of the present invention, cut vertically in the bridge axis direction. [Figure 13] FIG. 13 is a vertical cross-sectional view showing a bridge earthquake-resistant reinforcement device according to a fourth embodiment of the present invention, cut vertically in the bridge axis direction. [Figure 14] FIG. 14 is a vertical cross-sectional view showing a bridge earthquake-resistant reinforcement device according to a fifth embodiment of the present invention, cut vertically in the bridge axis direction. [Figure 15] FIG. 15 is a vertical cross-sectional view showing a bridge earthquake-resistant reinforcement device according to a sixth embodiment of the present invention, cut vertically in the bridge axis direction. [Figure 16] FIG. 16 is a vertical cross-sectional view showing a bridge earthquake-resistant reinforcement device according to the seventh embodiment of the present invention, cut vertically in the bridge axis direction. [Figure 17] FIG. 17 is a schematic diagram showing a structure of an additional flange of a conventional stopper device that can withstand upward force. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] Hereinafter, an earthquake-resistant reinforcement device for a bridge according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0034] [First embodiment] First, the earthquake-resistant reinforcement device for bridges according to the first embodiment of the present invention will be described with reference to Figures 1 to 8. This earthquake-resistant reinforcement will be described by taking as an example a case where a general bridge B1 of Type A specified in the 2002 Specifications for Highway Bridges, in which a concrete deck S1 is installed on steel girders G2 as a superstructure G1, is earthquake-resistant reinforced to a level equivalent to or higher than Type B specified in the 2002 Specifications for Highway Bridges (same below).

[0035] Fig. 1 is a partially enlarged side view of a bridge earthquake-resistant reinforcement device 1 according to a first embodiment of the present invention and a bridge B1, viewed in a direction perpendicular to the bridge axis, and Fig. 2 is a vertical cross-sectional view of the bridge B1, viewed in the bridge axis direction, with the bridge earthquake-resistant reinforcement device 1 and superstructure G1 cut vertically. Fig. 3 is a vertical cross-sectional view of the bridge earthquake-resistant reinforcement device 1, cut vertically in the bridge axis direction. In the figure, the symbol X indicates the bridge axis direction X of the bridge B1, and the symbol Y indicates the direction perpendicular to the bridge axis Y of the bridge B1 (the horizontal direction perpendicular to the bridge axis direction X). The symbol Z indicates the up-down direction.

[0036] As shown in Fig. 1 and Fig. 2, the bridge earthquake-resistant reinforcement device 1 according to the first embodiment of the present invention (hereinafter, simply referred to as the earthquake-resistant reinforcement device 1) is an earthquake-resistant reinforcement device that is interposed between the substructure A1 and the superstructure G1 of an existing bridge B1 during reinforcement work and reinforces earthquake resistance performance. In the illustrated embodiment, the earthquake-resistant reinforcement device 1 is explained by exemplifying a case in which a bracket Bk made of a steel material is protruded from the side of the existing substructure A1, which is an abutment, using a post-installed anchor AB, and an additional device is installed on the bracket Bk. Of course, if there is space to install the earthquake-resistant reinforcement device 1 in the existing substructure A1, it may be directly installed on the substructure A1 using an anchor or the like.

[0037] As shown in Figs. 1 to 3, this earthquake-resistant reinforcement device 1 includes a first member 2 and a second member 3. The first member 2 is connected to and supported by the substructure A1 via the bracket Bk, and the second member 3 is directly connected to and supported by the steel girder G2. In this way, the earthquake-resistant reinforcement device 1 has a horizontal force sharing function that resists the horizontal force acting on the bridge B1 by forming a shear key with the first member 2 and the second member 3 loosely fitting together. The upper adjustment plate 11 and the lower adjustment plate 12 are rectangular metal plates, and the upper adjustment plate 11 is tapered to make the longitudinal gradient of the steel girder G2 horizontal. Of course, if the superstructure is a concrete girder, it goes without saying that the earthquake-resistant reinforcement device 1 may be installed by installing appropriate anchors or the like.

[0038] (First member) 4 shows only the first member 2 of the seismic reinforcement device 1 according to this embodiment, where (a) is a front view and (b) is a plan view. Note that the front view refers to the surface of the seismic reinforcement device 1 shown in FIG. 1 as seen from the side of the bridge B1 along the direction Y perpendicular to the bridge axis (the same applies below).

[0039] 4, the first member 2 is made of a metal such as steel or cast iron, and has a rectangular (square) or circular base plate 20 and a protruding portion 21 protruding upward from the center of the base plate 20. The protruding portion 21 is a truncated cone-shaped protrusion with a gently curved (rounded) surface at the inside corner of the lower end and the outside corner of the upper end that connect to the base plate 20.

[0040] The tip (upper end) of this protrusion 21 is a threaded portion 22 having a screw thread formed thereon, onto which an additional flange 4, which will be described later, can be screwed.

[0041] As shown in FIGS. 4(b) and 4(a), the lower surface of the base plate 20 is formed with a plurality of bolt holes 23 for joining to the bracket Bk.

[0042] Furthermore, as shown in Figures 4(b) and 4(a), the convex portion 21 of the first member 2 is formed with a shoulder portion 24 that has a diameter larger than the outer diameter of the threaded portion 22 and protrudes radially outward from the axis of the convex portion 21 in a stepped shape.

[0043] (Second member) 5 shows only the second member 3 of the seismic reinforcement device 1 according to this embodiment, where (a) is a front view, (b) is a plan view, and (c) is a right side view. As shown in Fig. 5, the second member 3 is made of metal such as steel or cast iron, and is composed of a second member body 30 having a rectangular (rectangular) shape in a plan view, a recess 31 formed in the second member body 30, and a rectangular opening 32 formed at the lower end of the recess 31.

[0044] As shown in Fig. 5(a), the second member body 30 has a tapered shape that narrows toward the bottom when viewed from the front, with a tapered surface 30a formed therein, and as shown in Fig. 5(c), it is a rectangular frame when viewed from the side. A recess 31 that is recessed in a rectangular shape when viewed from above and is open at the top is formed inside the second member body 30. The upper part of the second member body 30 has a plate shape, and the upper part of the recess 31 may be closed. In short, it is sufficient that the above-mentioned protrusion 21 can be accommodated inside the recess 31.

[0045] 5(a) to 5(c), an opening 32 that is rectangular in plan view and slightly smaller than the recess 31 is formed below the recess 31. The protrusion 21 of the first member 2 described above is housed in a loose fit state inside the recess 31 and the opening 32. With this configuration, the seismic reinforcement device 1 exhibits a horizontal force sharing function that resists horizontal forces when the upper structure G1 moves horizontally relative to the lower structure A1 due to seismic motion, as the protrusion 21 comes into contact with the opening 32 via the buffer body 5 described below (see FIG. 3).

[0046] The upper surface of the second member body 30 is formed with a plurality of bolt holes 33 for joining to the steel girders G2 which are the superstructure G1.

[0047] (additional flange) As shown in FIG. 3, an additional flange 4 is screwed to the threaded portion 22 of the first member 2 described above.

[0048] Fig. 6 is a perspective view showing only the additional flange 4 of the seismic reinforcement device 1 according to this embodiment. As shown in Fig. 6, the additional flange 4 is composed of a disk-shaped flange body 40 made of metal such as steel that covers the first member 2, and a circular recess 41 formed in the center of the lower surface of the flange body 40.

[0049] Further, a screw groove 42 that screws onto the threaded portion 22 is formed on the inner peripheral surface of the circular recess 41 .

[0050] This additional flange 4 is attached to the tip of the protrusion 21 by screwing the screw groove 42 into the threaded portion 22 of the protrusion 21. The earthquake-resistant reinforcement device 1 is designed so that when the upper structure G1 moves horizontally relative to the lower structure A1 due to seismic motion, the outer circumferential end of the additional flange 4 abuts against the recess 31, thereby exerting a horizontal force sharing function that resists the horizontal force (see FIG. 3).

[0051] The additional flange 4' of the conventional stopper device was only designed to share horizontal forces and was designed to withstand upward loads, so it was a donut-shaped member with holes going through it vertically, as shown in Fig. 14, which was screwed onto the threaded portion 22. For this reason, if the dead load on one support line indicated by arrow A is 1.0, the additional flange 4' was designed to withstand an upward load of 0.3, as shown by arrow B (see 13.1 Support Section, Specifications for Highway Bridges and Commentary, Vol. V, Earthquake-Resistant Design, November 2017). Fig. 14 is a schematic diagram showing the structure of the additional flange of the conventional stopper device that can withstand upward loads.

[0052] Therefore, if a load is applied to an earthquake-resistant reinforcement device that has a horizontal force sharing function in order to simply function as a step prevention function, it is considered that the portion of the additional flange 4' indicated by the oval will be damaged, such as cracked, and will not be able to withstand the load. For this reason, the additional flange 4 in this embodiment is the aforementioned additional flange 4, which is a threaded disk with a lid structure (cap shape) that covers the first member 2 so that it can perform the step prevention function in cooperation with the spacer 6 described below.

[0053] As described above, the protrusion 21 is formed with a shoulder 24 that protrudes radially outward from the axis of the protrusion 21 in a stepped shape. Therefore, when the additional flange 4 is completely screwed into the threaded portion 22 and the bottom surface (horizontal surface) of the circular recess 41 abuts against the upper surface of the protrusion 21, the shoulder 24 abuts against the lower surface of the additional flange 4. Therefore, when the upper structure G1 falls and exerts its step prevention function, the threaded portion 22 of the additional flange 4 can be prevented from being damaged by the impact force of the fall by hooking the additional flange 4 with the shoulder 24.

[0054] In addition, taking into consideration the impact force of the upper structure G1 being dropped, the outward projection length d1 from the outer peripheral end of the threaded portion 22 of the shoulder portion 24 shown in Figure 4(a) is preferably 1 mm or more (in reality, 30 mm or less taking into consideration space), and more preferably 7 mm or more.

[0055] (buffer) 3, a cylindrical buffer 5 is fitted onto the outer circumferential surface of the protrusion 21. The buffer 5 is a rubber member made of a rubber elastic body (rubber material) that exhibits rubber elasticity at room temperature, such as EPDM (ethylene propylene diene monomer), CR (chloroprene) rubber, SBR (styrene-butadiene rubber), etc.

[0056] 7 is a perspective view showing only the buffer 5 of the earthquake-resistant reinforcement device 1 according to this embodiment. As shown in Fig. 7, the buffer 5 is mainly composed of a cylindrical buffer body 50, and a tapered opening 51 that increases in diameter downward in accordance with the truncated cone shape of the protrusion 21 is formed on the inner peripheral surface of the buffer body 50.

[0057] This buffer 5 has the function of mitigating the impact when the first member 2 and the second member 3 come into contact with each other by causing the outer circumferential surface of the buffer main body 50 to come into contact with the opening 32 before the outer circumferential end of the additional flange 4 comes into contact with the recess 31 when the upper structure G1 moves horizontally relative to the lower structure A1 due to seismic motion. This is to prevent the earthquake-resistant reinforcement device 1 from being damaged by seismic motion of about a predetermined level 1. It is also possible to omit this buffer 5.

[0058] (Spacer) 3, a disk-shaped spacer 6 is bonded and joined to the upper end of the protrusion 21 of the first member 2. Due to its thickness, the spacer 6 exhibits a step prevention function that prevents the upper structure G1 from falling and reduces the step on the top surface of the upper structure G1 when the upper bolt 9 breaks due to a level 2 earthquake motion and the above-mentioned horizontal force sharing function of the seismic reinforcement device 1 is damaged.

[0059] This spacer 6 is a disk-shaped member of a predetermined thickness and approximately the same diameter as the additional flange 4, and in this embodiment, like the buffer 5, it is a buffer material made of a rubber elastic body (rubber material) that exhibits rubber elasticity at room temperature, such as EPDM (ethylene propylene diene monomer), CR (chloroprene) rubber, SBR (styrene-butadiene rubber), etc.

[0060] However, the spacer 6 may be made of a metal such as steel, or may be made of an inorganic material such as concrete or mortar, or may be made of a resin, etc. In short, the spacer according to the present invention only needs to be made of a material having a predetermined compressive strength capable of withstanding the impact of the fall of the upper structure G1.

[0061] However, by constructing the spacer 6 from a rubber elastomer (rubber material), a cushioning effect is provided against the impact of the superstructure G1 falling during an earthquake, and even when an emergency vehicle subsequently passes over the superstructure G1, reducing the risk of damage to the steel girders G2 and substructure A1 and improving the repairability of the bridge B1, which is preferable.

[0062] Fig. 8(a) is a schematic diagram showing a state in which an unbalanced load acts on the spacer 6 and the additional flange 4 according to this embodiment. As shown in Fig. 8(a), when a load acts on the vicinity of the outer edge of the additional flange 4, by forming the spacer 6 from a rubber elastic body (rubber material), it is possible to prevent stress concentration by sharing the load with the entire rubber, for example, in a ratio of 8:2. Therefore, it becomes possible to support the dead load of the upper structure by the shear force of the plate thickness of the additional flange 4 of the lid structure and the distribution function of the spacer 6 made of rubber material, and it is possible to exhibit a step prevention function.

[0063] In contrast, as shown in Fig. 8(b), if there is only an additional flange made of a conventional perforated disk without rubber material, the load 10 acting near the outer edge of the additional flange 4 will be directly applied, and as described above, there is a high possibility that the area near the threaded portion 22 will be damaged and broken. Fig. 8(b) is a schematic diagram showing a state in which an unbalanced load is acting on a conventional stopper device.

[0064] The thickness of the spacer 6 is determined as appropriate depending on the distance between the upper structure G1 and the convex portion 21, the distance between the second member 3 and the convex portion 21, or the distance between the upper structure G1 and the second member 3 and the intermediate object or the convex portion 21. In short, the thickness of the spacer 6 is determined from the viewpoint of being able to exert the above-mentioned step prevention function of reducing the step by restricting the height to which the upper structure G1 falls, without impeding the above-mentioned horizontal force sharing function, in response to normal rotation of the upper structure G1, without the spacer 6 adhered to the tip of the convex portion 21 coming into contact with the upper structure G1, etc.

[0065] However, it is preferable that the spacer 6 is made of a rubber elastic body (rubber material) having a thickness of at least 5 mm to 200 mm. By ensuring that the spacer 6 has a predetermined thickness or more, it can not only support dead loads in an emergency, but also have the function of substituting part of the support function by being able to withstand live loads from passing vehicles to a certain extent.

[0066] That is, the spacer 6 has the function of resisting loads including dead loads, horizontal loads caused by temperature changes, and rotational loads caused by vertical movement (vibration) of the girder for a short period of time due to the thickness of the rubber elastic body (rubber material), and of safely supporting a fallen superstructure by substituting part of the support function. Note that substituting part of the support function means that in an emergency such as when the superstructure G1 falls, it will perform a support function to the extent that emergency vehicles and general vehicles can pass through for a certain period of time until it is restored.

[0067] (Metal plate) As shown in Figs. 1 and 2, the seismic reinforcement device 1 has a first member 2 and a second member 3 bolted together via a metal plate 7 made of steel or the like. The metal plate 7 has long holes in the vertical direction and long holes in the horizontal direction, and the first member 2 and the second member 3 are joined together via these long holes when the seismic reinforcement device is installed. Therefore, the metal plate 7 can be removed after the seismic reinforcement device is installed, and can perform the step prevention function in the same way as the spacer 6, without impeding the horizontal force sharing function described above. The metal plate 7 can also be omitted.

[0068] [Modification of the first embodiment] Next, a modified example of the bridge earthquake-resistant reinforcement device 1 according to the first embodiment will be described with reference to Fig. 9. Fig. 9 is a partially enlarged side view (corresponding to Fig. 1) showing a modified example of the bridge earthquake-resistant reinforcement device 1 according to the first embodiment of the present invention and the bridge, viewed in a direction perpendicular to the bridge axis. As shown in Fig. 9, the earthquake-resistant reinforcement device 1 according to the modified example of the first embodiment has the same configuration as the previously described earthquake-resistant reinforcement device 1, but is installed with the top and bottom reversed to the previously described earthquake-resistant reinforcement device 1.

[0069] In short, as shown in Fig. 9, the first member 2 is bolted to the steel girder G2 which is the superstructure G1, and the second member 3 is bolted to the bracket Bk protruding from the side of the substructure A1. However, other configurations are the same as those of the above-mentioned earthquake-resistant reinforcement device 1, so detailed explanations are omitted. However, because the earthquake-resistant reinforcement device 1 needs to remain on the bracket Bk even after an earthquake, the weak point needs to be the upper bolt 9' on the upper side, which differs from the fourth embodiment described later (see also paragraph

[0065] ).

[0070] [Effects of earthquake-resistant reinforcement devices for bridges] According to the bridge earthquake-resistant reinforcement device 1 of the embodiment of the present invention described above, it is possible to combine the horizontal force sharing function with the step prevention function, making it possible to install the earthquake-resistant reinforcement device 1 in a space-saving manner and effectively utilizing the narrow space around the bearings to reduce installation costs.

[0071] Furthermore, according to the earthquake-resistant reinforcement device 1, since it is not necessarily necessary to extend the bracket Bk, etc. from the lower structure A1, even if there is no room to extend the bracket Bk, etc. from the lower structure A1, it is possible to provide a dual-purpose device that combines a horizontal force sharing function and a step prevention function.

[0072] Furthermore, the earthquake-resistant reinforcement device 1 makes it easy to maintain and manage the device even in the narrow space around the bearing, and makes it possible to find and deal with any defects early on.

[0073] Furthermore, according to the earthquake-resistant reinforcement device 1, since the spacer 6 is a buffer material made of a rubber elastic body, even if an emergency vehicle passes over the earthquake-resistant reinforcement device 1 where the horizontal force distribution function has been damaged and a small step has been created, the risk of damage to the steel girder G2, which is the main girder, and the substructure A1 is reduced. This improves the repairability of the bridge B1. Also, according to the earthquake-resistant reinforcement device 1, by configuring the spacer 6 from a rubber elastic body (rubber material), it is possible to share the load with the entire rubber and prevent stress concentration. Therefore, it is possible to support the dead load of the superstructure with the shear force of the plate thickness of the additional flange 4 of the lid structure and the distribution function of the spacer 6 made of rubber material, and it is possible to demonstrate the step prevention function.

[0074] In addition, according to the earthquake-resistant reinforcement device 1, since the spacer 6 is joined to the tip of the convex portion 21, when the first member 2 and the second member 3 operate and move horizontally relative to each other, the spacer 6 does not interfere, and there is no risk that the step prevention function will hinder the horizontal force sharing function.

[0075] [Second embodiment] Next, an earthquake-resistant reinforcement device 1' for a bridge according to a second embodiment of the present invention (hereinafter, simply referred to as earthquake-resistant reinforcement device 1') will be described with reference to Figs. 10 and 11. Fig. 10 is a vertical cross-sectional view (corresponding to Fig. 3) showing the earthquake-resistant reinforcement device 1' for a bridge according to the second embodiment of the present invention, cut vertically in the bridge axis direction. Fig. 11 is a perspective view showing only the additional flange 4' of the earthquake-resistant reinforcement device 1'. The earthquake-resistant reinforcement device 1' differs from the above-mentioned earthquake-resistant reinforcement device 1 mainly in the attachment position of the spacer 6', and therefore this point will be described, and other identical components will be given the same reference numerals and will not be described.

[0076] The spacer 6' of the earthquake-resistant reinforcement device 1' is a shock-absorbing material made of a rubber elastic body (rubber material). As shown in Fig. 10, the spacer 6' is placed on a rectangular (square) plate 8 made of a steel plate or the like, which is one size larger than the base plate 20 joined to the first member 2 and integrated with the first member 2. Of course, the spacer 6' may be made of a metal such as steel, like the spacer 6, or may be made of an inorganic material such as concrete or mortar, or a resin.

[0077] This spacer 6' is a donut-shaped or rectangular member having an inner diameter slightly larger than that of the base plate 20 of the first member 2, and has an inner diameter that does not hinder the relative horizontal movement of the first member 2 and the second member 3, which functions as a horizontal force sharing function.

[0078] Since the additional flange 4' does not directly perform the step prevention function and does not bear any load, as shown in Fig. 11, like the conventional additional flange, it is composed of a perforated disk-shaped flange body 40' made of metal such as steel, and a circular opening 41' formed in the center of the underside of this flange body 40. Also, a thread groove 42' that screws into the threaded portion 22 described above is formed on the inner circumferential surface of this circular opening 41'.

[0079] According to the earthquake-resistant reinforcement device 1' for a bridge in the second embodiment of the present invention, like the earthquake-resistant reinforcement device 1, it can combine the horizontal force distribution function and the step prevention function, so that the earthquake-resistant reinforcement device 1' can be installed in a space-saving manner, and the installation costs can be reduced by effectively utilizing the narrow space around the supports.

[0080] [Third embodiment] Next, using FIG. 12, we will explain the earthquake-resistant reinforcement device 1" for bridges according to the third embodiment of the present invention (hereinafter also simply referred to as earthquake-resistant reinforcement device 1"). FIG. 11 is a vertical cross-sectional view (equivalent to FIG. 3) showing the earthquake-resistant reinforcement device 1" for bridges according to the third embodiment of the present invention, cut vertically in the bridge axis direction. The earthquake-resistant reinforcement device 1" differs from the above-mentioned earthquake-resistant reinforcement device 1' only in the attachment position of the spacer 6", and so this point will be explained, and other identical components will be given the same symbols and explanations will be omitted.

[0081] The spacer 6" of the earthquake-resistant reinforcement device 1" is a cushioning material made of a rubber elastic body (rubber material), and is placed on the base plate 20 of the first member 2 described above, as shown in FIG. 11. Of course, the spacer 6' may also be made of metal such as steel, or may be made of inorganic materials such as concrete or mortar, or resin.

[0082] This spacer 6' is a donut-shaped or rectangular member having an inner diameter slightly larger than that of the base plate 20 of the first member 2, and has an inner diameter that does not hinder the relative horizontal movement of the first member 2 and the second member 3, which functions as a horizontal force sharing function.

[0083] According to the earthquake-resistant reinforcement device 1" for a bridge in accordance with the third embodiment of the present invention, like the earthquake-resistant reinforcement device 1, it is possible to combine the horizontal force sharing function and the step prevention function, so that the earthquake-resistant reinforcement device 1" can be installed in a space-saving manner, and the installation costs can be reduced by effectively utilizing the narrow space around the bearings.

[0084] [Fourth embodiment] Next, a bridge earthquake-resistant reinforcement device 10 according to a fourth embodiment of the present invention (hereinafter, simply referred to as the earthquake-resistant reinforcement device 10) will be described with reference to Fig. 13. Fig. 13 is a vertical cross-sectional view showing the bridge earthquake-resistant reinforcement device 10 according to the fourth embodiment of the present invention, cut vertically in the bridge axis direction. The earthquake-resistant reinforcement device 10 differs from the above-mentioned earthquake-resistant reinforcement device 1 mainly in that the additional flange 4' is a conventional disk-shaped flange with holes. Therefore, other identical components are given the same reference numerals and descriptions are omitted.

[0085] If a load is applied to the seismic reinforcement device, which has a horizontal force sharing function, in an attempt to simply function as a step prevention function, it is believed that the portion of the additional flange indicated by the oval will crack or be damaged and will not be able to withstand the load. For this reason, the spacer 60 according to this embodiment is made larger and thicker than the above-mentioned spacer 6, and is mechanically screwed to the additional flange 4' with screws B2 or the like to compensate for the lack of adhesive strength with the additional flange 4'. However, the joining of the spacer 60 to the additional flange 4' is not limited to screwing, and it may be joined by providing a locking piece on one or both of them to hook the other, and mechanically fastening the two.

[0086] The spacer 60 according to this embodiment is a buffer material made of a rubber elastic body (rubber material) like the spacer 6. Of course, like the spacer 6, the spacer 60 may be made of a metal such as steel, or may be made of an inorganic material such as concrete or mortar, or may be made of resin.

[0087] It should be noted that the spacer 60 in this embodiment is not mechanically fixed to the additional flange 4' by screwing it, but rather may be bonded to the additional flange 4' using an adhesive capable of strong adhesion in order to increase adhesive strength (for example, bonded with an elastic adhesive that flexibly absorbs and disperses internal and external stresses applied to the joint and has good adhesion to rubber elastomers), or may be vulcanized by applying heat and pressure to the additional flange 4'.

[0088] The bridge earthquake reinforcement device 10 according to the fourth embodiment of the present invention can perform both the horizontal force distribution function and the step prevention function, similar to the earthquake reinforcement device 1, so that the earthquake reinforcement device 10 can be installed in a space-saving manner, and the installation costs can be reduced by effectively utilizing the narrow space around the supports.

[0089] [Fifth embodiment] Next, an earthquake-resistant reinforcement device 13 for a bridge according to a fifth embodiment of the present invention (hereinafter, simply referred to as the earthquake-resistant reinforcement device 13) will be described with reference to Fig. 14. Fig. 14 is a vertical cross-sectional view showing the earthquake-resistant reinforcement device 13 for a bridge according to the fifth embodiment of the present invention, cut vertically in the bridge axis direction. The earthquake-resistant reinforcement device 13 differs from the above-described earthquake-resistant reinforcement device 1 mainly in that, in addition to the spacer 6, a second spacer 61 is interposed between the first member 2 and the plate 8. Therefore, other identical components are given the same reference numerals and descriptions thereof will be omitted.

[0090] The second spacer 61 of the earthquake-resistant reinforcement device 13 is a buffer material made of a rubber elastic body (rubber material) having a thickness of at least 5 mm to 200 mm, and is interposed between the base plate 20 of the first member 2 and the plate 8, as shown in Fig. 14. This second spacer 61 is a rectangular member having an area approximately the same as that of the base plate 20 of the first member 2 in a plan view, and has a function of not only supporting dead loads in an emergency, but also substituting part of the bearing function to be able to withstand to a certain extent live loads from passing vehicles, etc.

[0091] That is, the second spacer 61 has a function of resisting loads including dead loads, horizontal loads caused by temperature changes, and rotational loads caused by vertical movement (vibration) of the girder for a short period of time due to the thickness of the rubber elastic body (rubber material), and can safely support a fallen superstructure by substituting part of the support function. Note that substituting part of the support function means that in an emergency such as when the superstructure G1 falls, it exerts a support function to the extent that emergency vehicles and general vehicles can pass through for a certain period of time until it is restored.

[0092] The bridge earthquake reinforcement device 13 according to the fifth embodiment of the present invention can perform both the horizontal force distribution function and the step prevention function, similar to the earthquake reinforcement device 1, so that the earthquake reinforcement device 13 can be installed in a space-saving manner, and the installation costs can be reduced by effectively utilizing the narrow space around the supports.

[0093] Furthermore, according to the earthquake-resistant reinforcement device 13, the second spacer 61 made of a rubber elastic material can take over part of the support function in the event of an emergency such as when the superstructure G1 falls due to an earthquake, thereby safely supporting the fallen superstructure.

[0094] [Sixth embodiment] Next, a bridge earthquake-resistant reinforcement device 14 according to a sixth embodiment of the present invention (hereinafter, simply referred to as the earthquake-resistant reinforcement device 14) will be described with reference to Fig. 15. Fig. 15 is a vertical cross-sectional view showing the bridge earthquake-resistant reinforcement device 14 according to the sixth embodiment of the present invention, cut vertically in the bridge axis direction. The earthquake-resistant reinforcement device 14 differs from the above-mentioned earthquake-resistant reinforcement device 13 mainly in that the base plate 20' and the second spacer 62 of the first member 2 have larger areas than the above-mentioned base plate 20 and second spacer 61, and that a core rod 15 is provided. Therefore, other identical components are given the same reference numerals and descriptions thereof will be omitted.

[0095] The second spacer 62 of the earthquake-resistant reinforcement device 14 is a buffer material made of a rubber elastic body (rubber material) with a thickness of about 5 mm, and is interposed between the base plate 20' of the first member 2 and the plate 8, as shown in Fig. 15. This second spacer 62, like the second spacer 61, is a rectangular member having an area approximately the same as that of the base plate 20' of the first member 2 in a plan view, and has a function of not only supporting dead loads in an emergency but also substituting part of the bearing function to be able to withstand to a certain extent live loads from passing vehicles, etc.

[0096] The base plate 20' and the second spacer 62 of the first member 2 of the seismic reinforcement device 14 have an area 1.3 times or more larger than the above-mentioned base plate 20 and spacer 61 in a plan view, and by increasing the area of ​​the second spacer 62, the load that can be supported per unit area is reduced, improving the load-bearing capacity. This improves the substitutability of the bearing function of the second spacer 62 and improves the load-bearing capacity.

[0097] As shown in Fig. 15, the earthquake-resistant reinforcement device 14 is provided with a core rod 15. This core rod 15 is fixed to the plate 8 or the bracket Bk by screwing or welding, etc., and has the function of restraining the base plate 20' from shifting in the horizontal direction. This is to prevent the second spacer 62 made of a rubber elastic body from being deformed due to temperature changes in the bridge body, which would cause it to be unable to support the vertical load. The core rod 15 can also be substituted for the first member 2 by using thicker bolts to fasten it.

[0098] The bridge earthquake reinforcement device 14 according to the sixth embodiment of the present invention can perform both the horizontal force distribution function and the step prevention function, similar to the earthquake reinforcement device 1, so that the earthquake reinforcement device 14 can be installed in a space-saving manner, and the installation costs can be reduced by effectively utilizing the narrow space around the bearings.

[0099] In addition, according to the earthquake-resistant reinforcement device 14, the second spacer 62 made of a rubber elastic material can take over part of the support function in the event of an emergency such as when the superstructure G1 falls due to an earthquake, thereby safely supporting the fallen superstructure.

[0100] Moreover, according to the earthquake-resistant reinforcement device 14, the superstructure G1 is supported by the second spacer 62 made of a rubber elastic body with an area 1.3 times larger than that of the second spacer 61, so the load supported per unit area can be reduced and the load-bearing capacity is improved. In addition, the earthquake-resistant reinforcement device 14 restrains the base plate 20' from shifting in the horizontal direction by the core rod 15, and the second spacer 62 does not impair the horizontal force sharing function of the earthquake-resistant reinforcement device 14.

[0101] [Seventh embodiment] Next, a bridge earthquake-resistant reinforcement device 16 according to a seventh embodiment of the present invention (hereinafter, simply referred to as the earthquake-resistant reinforcement device 16) will be described with reference to Fig. 16. Fig. 16 is a vertical cross-sectional view showing the bridge earthquake-resistant reinforcement device 16 according to the seventh embodiment of the present invention, cut vertically in the bridge axis direction. The earthquake-resistant reinforcement device 16 differs from the above-described earthquake-resistant reinforcement device 1 mainly in that an upper adjustment plate 11' is provided and that a recess 110' is formed in the upper adjustment plate 11'. Therefore, other identical components are given the same reference numerals and descriptions thereof will be omitted.

[0102] 16, the earthquake-resistant reinforcement device 16 is provided with an upper adjustment plate 11' on which a tapered surface (inclined surface) corresponding to the longitudinal gradient of the steel girder G2 is formed. Like the above-mentioned upper adjustment plate 11, this upper adjustment plate 11' is a member for horizontally installing the first member 2 and the second member 3 by being interposed between the steel girder G2 and the second member 3 in order to horizontally adjust the longitudinal gradient of the steel girder G2.

[0103] A recess 110' is provided on the lower surface of the upper adjustment plate 11' of the seismic reinforcement device 16 according to this embodiment. This recess 110' is a recess for preventing the spacer 60' from contacting the upper adjustment plate 11' and interfering with it during horizontal movement so that the horizontal force sharing function of the seismic reinforcement device 16 is not impaired.

[0104] This spacer 60' is a shock absorbing material made of an elastic rubber body (rubber material) with a thickness of about 20 mm, and by making it thicker than the above-mentioned spacer 6, it is possible to improve the substitutability of the support function in an emergency.

[0105] In addition, the additional flange 4'' also has a thicker portion that covers the second member 3 than the previously described additional flange 4, thereby enhancing the strength capable of withstanding the impact when the upper structure G1 is dropped.

[0106] However, in the seismic reinforcement device 16, even though the thickness of the spacer 60' and the additional flange 4" has been increased, the other members such as the first member 2 and the second member 3 can use the same members of a conventional seismic reinforcement device that only has a horizontal force sharing function. Therefore, conventional manufacturing equipment can be used as is, and manufacturing costs can be reduced.

[0107] The bridge earthquake reinforcement device 16 according to the seventh embodiment of the present invention can perform both the horizontal force distribution function and the step prevention function, similar to the earthquake reinforcement device 1, so that the earthquake reinforcement device 16 can be installed in a space-saving manner, and the installation costs can be reduced by effectively utilizing the narrow space around the supports.

[0108] Furthermore, with the earthquake-resistant reinforcement device 16, the spacer 60' made of a rubber elastic material can take over part of the support function in an emergency such as when the superstructure G1 falls due to an earthquake, thereby safely supporting the fallen superstructure, and can also reduce manufacturing costs.

[0109] The above provides a detailed explanation of the bridge earthquake-resistant reinforcement devices 1, 1'1'', 10, 13, 14, and 16 according to the first to seventh embodiments of the present invention. However, the above-mentioned or illustrated embodiments each show merely one embodiment realized in carrying out the present invention. Therefore, the technical scope of the present invention should not be interpreted in a limited manner based on these.

[0110] In particular, the spacer according to the present invention is not limited to the first to seventh embodiments shown as examples, and may be provided between the upper adjustment plate 11 and the second member 3, between the upper adjustment plate 11 and the upper structure G1, between the first member 2 and the lower adjustment plate 12, or between the lower adjustment plate 12 and the bracket Bk or the lower structure A1, as shown in Figures 1 and 2. In short, the spacer according to the present invention may be provided between the first member 2 and the second member 3, or between the lower structure A1 or the upper structure G1 and the seismic reinforcement device 1. [Explanation of symbols]

[0111] 1,1',1”,10,13,14,16: Earthquake-resistant reinforcement device (earthquake-resistant reinforcement device for bridges) 2: First member 20,20': Base plate 21: Convex 22: Screw section 23:Bolt hole 24:Shoulder 3: Second member 30: Second member body 30a: Tapered surface 31: Recess 32:Aperture 33: Bolt hole 4,4',4”: additional flange 40,40': Flange body 41;Circular recess 41':Circular opening 42,42': Thread groove 5:Buffer 50:Buffer body 51: Tapered opening 6,6',6”,60,60': Spacer 61,62: Second spacer 7: Metal plate 8: Plate 9,9': Upper bolt 11,11': Upper adjustment plate 12: Lower adjustment plate 15: Mandou B1: Bridges G1:Superstructure G2: Main girder (superstructure) A1: Substructure Bk: Bracket S1: Concrete deck AB: Post-installed anchor B2: Bis

Claims

1. A bridge seismic reinforcement device that is added between the substructure and superstructure of an existing bridge to reinforce the seismic performance, The present invention provides a horizontal force sharing function that resists horizontal forces by providing a first member having a convex portion and a second member having a concave portion, the first member being connected to and supported by either the lower structure or the upper structure, and the second member being connected to and supported by the other of the two, whereby the convex portion and the concave portion fit loosely into each other to form a shear key, and a spacer having a predetermined thickness is interposed between the first member and the second member, or between the lower structure or the upper structure and the seismic reinforcement device, to prevent the upper structure from falling and to reduce the step between the two, The spacer is located only above the upper end of the protrusion. A bridge earthquake reinforcement device characterized by the above.

2. The spacer is a cushioning material that contains a rubber elastic body in part or is entirely made of a rubber elastic body.

2. The bridge earthquake reinforcement device according to claim 1 .

3. The spacer is to substitute for part of the support function in an emergency.

3. The bridge earthquake reinforcement device according to claim 2,

4. The spacer is joined to the upper end of the protrusion.

4. The bridge earthquake-resistance reinforcement device according to claim 1,

5. The first member has a disk-shaped additional flange that is fixed to cover an upper end of the protruding portion, and the spacer is joined to an upper surface of the additional flange.

5. The bridge earthquake-resistance reinforcement device according to claim 4.

6. The spacer is mechanically fixed to the upper end surface of the protrusion, or is bonded with an elastic adhesive, or is vulcanization-bonded.

5. The bridge earthquake-resistance reinforcement device according to claim 4.

7. A second spacer made of a rubber elastic body is provided. The first member is attached via the second spacer, and the second spacer serves as a substitute for a part of the support function in the event of an emergency.

5. The bridge earthquake-resistance reinforcement device according to claim 4.

8. A shaft is provided to restrain the horizontal displacement of the first member.

8. The bridge earthquake-resistance reinforcement device according to claim 7.

9. Further, the upper structure has an upper adjustment plate according to the slope of the upper structure.

9. The bridge earthquake-resistance reinforcement device according to claim 1,

10. The upper adjustment plate has a recess formed on the lower surface thereof to prevent interference with the spacer.

10. The bridge earthquake-resistance reinforcement device according to claim 9.

11. The first member has a shoulder portion that protrudes outward, and the shoulder portion abuts against a lower surface of the additional flange in a state in which the additional flange abuts against an upper surface of the protruding portion.

6. The bridge earthquake-resistance reinforcement device according to claim 5.

12. 2. The bridge earthquake reinforcement device according to claim 1, wherein a shock absorber is fitted to an outer peripheral surface of the protruding portion.

13. A bridge seismic reinforcement device that is added between the substructure and superstructure of an existing bridge to reinforce the seismic performance, a first member having a convex portion and a second member having a concave portion, the first member being connected to and supported by either the lower structure or the upper structure, and a buffer body being fitted to an outer peripheral surface of the convex portion; The second member is connected to and supported by the other of the two members, and the convex portion and the concave portion are loosely fitted into each other to form a shear key, thereby providing a horizontal force sharing function that resists horizontal forces; Between the first member and the second member, or between the lower structure or the upper structure and this A spacer of a specified thickness is interposed between the seismic reinforcement device to prevent the upper structure from falling. and has a step prevention function that reduces the step between the two. A bridge earthquake reinforcement device characterized by the above.

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