JP2004300897A - Repairing structure for existing bearing apparatus and repairing method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repairing structure for an existing bearing apparatus, which is implemented by using an existing base plate and anchor bolts, need not secure a high under-girder installation space, and is free from a fear of interference with a jack-up space in a bridge axial direction, and to provide a repairing method for the existing bearing apparatus. <P>SOLUTION: In implementation of the repairing structure for the existing bearing apparatus, a new base plate 9 is carried in from a direction at right angles to the bridge axis and fixed to the existing base plate 1 of the existing bearing apparatus. The new base plate has a bridge axial dimension smaller than an inner axial interval between a pair of the anchor bolts 3 which fix the existing base plate 1 at its ends in the direction at right angles to the bridge axis. Then a shear deformation restricting-cum-bearing member 12 is carried in from the direction at right angles to the bridge axis and fixed to the new base plate 9. The member 12 has a bridge axial dimension smaller than the inner axial interval between the pair of the anchor bolts 3. Further an elastic load bearing body 15 is set in the shear deformation binding member 12, and a superstructure 7 is borne by the elastic load bearing body 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a repair method and a repair structure for an existing elastic device using an existing elastic device without removing a base plate and an anchor bolt without removing the base plate and the anchor bolt in an elevated road bridge or a bridge.
[0002]
[Prior art]
Conventionally, when the bearing device is replaced, for example, a steel bearing device 20 using a seismic intensity method of fixing a base plate 1 to an undercarriage with an anchor bolt 3 as shown in FIG. However, in the case of a type B steel bearing device, the size in the vertical direction is increased, and it is difficult to allow an increase in the size in the vertical direction. In a two- or three-story elevated road bridge or the like, the upper structure (girder) supported by the bearing device cannot be located at a high level, so that a space for installing a type B steel bearing device cannot be secured. There is a problem that a type B steel bearing device cannot be installed.
[0003]
Further, when the bearing device is replaced, there is a problem that if the base plate and the anchor bolts of the existing bearing device are removed, the replacement of the bearing device becomes large and the construction cost becomes extremely high.
In addition, when replacing the bearing device with the upper structure leveled up by jacks installed on the lower structure in the bridge axis direction, there is a jack in the bridge axis direction, so the jack-up space And it is not possible to insert and arrange the bearing device from the bridge axis direction.
[0004]
[Non-patent document 1]
Road Bridge Specification (V Seismic Design Edition) Published by The Japan Road Association, April 10, 2002, 245
[0005]
[Problems to be solved by the invention]
The present inventor has conducted various studies on a bearing device that can simultaneously and advantageously solve the above three problems, and as a result, the thickness of an elastic layer such as a rubber layer in the vertical direction can be made relatively thin, and Use a function-separated type bearing device that can keep the installation space within the existing bearing device within the existing bearing device, restrain the shear deformation of the rubber layer and support the vertical load of the superstructure with a high bearing load, and restrain the shear deformation. The present invention has been completed by finding that the member can be inserted into the existing base plate in a direction perpendicular to the bridge axis and the member can be inserted into the existing base plate, and the existing base plate and anchor bolts can be used.
[0006]
The present invention makes it possible to set the space for installing the support device in the vertical direction below the girder within the existing support device, and utilizes the base plate and the anchor bolts installed on the lower structure without removing them. Therefore, the present invention provides a repair structure and a repair method for an existing bearing device that can be installed at a low cost without hanging work of a lower structure and without obstructing a jack-up space arranged in the bridge axis direction. The purpose is to do.
I do.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in a repair structure of an existing support device using an existing base plate according to claim 1, an existing base plate is provided on an existing base plate of an existing support device installed in a lower structure. A new base plate having a dimension in the bridge axis direction smaller than the inner dimension in the bridge axis direction between the pair of anchor bolts at the end portion in the direction perpendicular to the bridge axis is carried in from the direction perpendicular to the bridge axis and fixed. A shear deformation restraining and supporting member having a dimension in the bridge axis direction smaller than the inner dimension of the pair of anchor bolts in the bridge axis direction is carried in and fixed to the newly installed base plate from a direction perpendicular to the bridge axis. An elastic bearing for load support is installed in the inside, and the upper structure is supported by the elastic bearing for load bearing.
[0008]
Further, in the invention of claim 2, in the repair structure of the existing support device using the existing base plate according to claim 1, the shear deformation restraining and supporting member is a hollow annular member, which also serves as a side block. It is a member.
[0009]
Further, according to the invention of claim 3, in the repair structure of the existing bearing device using the existing base plate according to claim 1 or 2, the new base plate is fixed to the existing base plate by welding, and the new base plate is fixed. The shear deformation restraining and supporting member is detachably fixed to the base plate by bolts, and is detachably mounted so that the upper portion of the load bearing elastic bearing protrudes into the space formed by the new base plate and the shear deformation restraining and supporting member. Characterized by being arranged in
[0010]
Further, in the method for repairing an existing bearing device using an existing base plate according to claim 4, the repair method for repairing the existing bearing device to an elastic bearing device includes a jack disposed on a lower structure in a bridge axis direction. In a state where the upper structure is jacked up and supported, after removing the upper part of the bearing device on the existing base plate without removing the base plate and the anchor bolt in the existing bearing device installed on the lower structure, A new base plate, whose dimension in the bridge axis direction is smaller than the inner space between the pair of anchor bolts at the end perpendicular to the bridge axis at which the existing base plate is fixed, is carried in from the direction perpendicular to the bridge axis and fixed to the existing base plate. And then attaches to the newly installed base plate the inner distance between the pair of anchor bolts. The shear deformation restraining and supporting member having a small dimension in the bridge axis direction is carried in from the direction perpendicular to the bridge axis and fixed, and then, after the elastic supporting body for load support is installed in the shear deformation restraining supporting member, the upper structure is removed. The upper structure is supported by the load-bearing elastic bearing body by being lowered.
[0011]
According to the present invention, it is possible to use the base plate and the anchor bolts of the existing support device without increasing the vertical dimension under the girder where the support device is installed, and obstruct the jack-up space of the upper structure in the bridge axis direction. The new base plate and the shear deformation restraining and supporting member with a small dimension within the anchor bolt spacing dimension can be loaded and installed from the direction perpendicular to the bridge axis, and the construction cost of the newly installed bearing device can be reduced. Moreover, it can be easily repaired.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described in detail with reference to the illustrated embodiment.
[0013]
First, a description will be given of the planar state of FIG. 7 in which the upper part of the existing bearing device is removed. FIG. 7 shows that the base plate 1 and the base plate 1 of the existing bearing device 20 are fixed to the concrete lower structure 2. The heads of the anchor bolts 3 previously embedded and fixed in the lower structure 2 are inserted into the through holes at the four corners of the base plate 1 and are left fixed by the washers 4 and the nuts 5. 2, the upper structure 7 such as the spar 6 is jacked up by a jack 8 indicated by a two-dotted line disposed on the lower structure 2 on its lower surface, and The upper part of the existing bearing device 20 on the base plate 1 or the entire upper part is removed.
Further, in FIG. 8, a new base plate 9 is loaded from the state of FIG. 7 onto the existing base plate 1 in a direction perpendicular to the bridge axis, and the peripheral edge of the new base plate 9 is fixed by welding 38 and installed. The state shown is shown.
[0014]
The direction indicated by the arrow A in each of FIGS. 7 and 8 is the direction perpendicular to the bridge axis, and the new base plate 9 is provided between the anchor bolts 3 fixing the existing base plate 1 at both ends in the direction perpendicular to the bridge axis. Is a new base plate 9 having a dimension L1 in the direction perpendicular to the bridge axis smaller than the inner gap dimension L in the direction of the bridge axis, and the base plate 9 is made of a steel plate material.
[0015]
As shown in FIG. 5, on the upper surface of the new base plate 9, circular upward opening recesses 10 are provided on both sides in the direction perpendicular to the bridge axis, and the upward opening recess 10 is formed of a steel cylindrical shear key. 11 is a concave portion for fitting and accommodating a lower portion of the lower portion 11 (see FIG. 3).
[0016]
In addition, on both sides of the base plate 9 in the direction perpendicular to the bridge axis, there are a plurality of gaps for fixing the shear deformation restraining and supporting members 12 shown in FIG. Female screw hole 13 is provided.
[0017]
From the state of FIG. 8, the shear deformation restraining and supporting member 12 shown in FIG. 6 is smaller than the inner dimension L in the bridge axis direction between the anchor bolts 3 as described above, as shown in FIG. After being placed on the existing rectangular steel base plate 1 having L1, the lower portion of the shear deformation restraining and supporting member 12 is fixed to the existing base plate 1 by welding.
[0018]
As shown in FIG. 6, the shear deformation restraining and supporting member 12 is provided with a downward opening recess 14 for fittingly housing the upper portion of the shear key 11 on both lower surfaces in the direction perpendicular to the bridge axis. At the center of the deformation restraining and supporting member 12, there is provided a relatively large-diameter circular hole 16 for accommodating and disposing a high bearing elastic supporting body 15 to be described later. At both sides in the direction perpendicular to the bridge axis 12, at a position away from the circular hole 16 in the direction perpendicular to the bridge axis, a support projection 22 at the center in the bridge axis direction rising upward and a higher level than the support projection 22. And a movement-restricting support protrusion 22a at the end of the bridge-axis direction at the position. A flat upper surface 23 of the support protrusion 22 is fixed to a later-described upper lift holding member 17 at a central portion in the bridge-axis direction. Female threaded holes 18 are provided for Each bearing protrusions 22a on both sides of the female screw hole 18, bolt insertion holes 21 are provided. When the girder 6 is lowered, the upper surface level of the bearing step 22 is equal to the upper surface 35 provided on both upper surfaces of the upper shoe 27 fixed to the lower surface of the girder 6 in the direction perpendicular to the bridge axis. The height is set so that they are almost the same level.
[0019]
The vertical wall 19 in the inner circumferential direction of the circular hole 16 penetrating the center portion of the shear deformation restraining and supporting member 12 is provided with a high bearing elastic bearing 15 as a load bearing elastic bearing 15 shown in FIG. This will restrict the lateral movement of the upper steel member 24 in the following.), Thereby indirectly restraining the shear deformation of the elastic layer 25 such as rubber in the high bearing elastic bearing 15 and elasticity. The structure is such that the layer 25 bears only a vertical load.
[0020]
The height around the circular hole 16 penetrating the center of the shear deformation restraining and supporting member 12 is set at the middle part (almost the center) of the thickness of the upper steel member 24 in the high bearing elastic bearing 15. The upper bearing member 15 has a height dimension configured to be positioned so as to allow the upper steel member 24 to move vertically in the high bearing elastic bearing body 15, and to restrict the lateral movement of the upper steel member 24. It is configured.
[0021]
A groove-shaped space portion 26 between the substantially rectangular support protrusions (projections) 22 extending in the bridge axis direction on both sides of the shear deformation restraining and supporting member 12 in the direction perpendicular to the bridge axis is described later. A space in which the upper shoe 27 is arranged, and movement of the upper shoe 27 in the direction perpendicular to the bridge axis is restricted by the inner side surface of the bearing projection 22, so that the upper shoe 27 can be moved in the bridge axis direction. Have been.
[0022]
After being installed on the shear deformation restraining and supporting member 12 and the newly provided base plate 9, as shown in FIG. 3, the steel cylindrical shear keys are respectively inserted into the upward opening recesses 10 for storing the respective shear force keys. 6 is carried in the existing base plate 1 from between the anchor bolts 3 in the direction perpendicular to the bridge axis, and the shear deformation restraining and supporting member 12 shown in FIG. The bolt 28 is fitted into the downward opening recess 14 of the dual support member 12, and the bolt 28 is inserted into the bolt insertion hole 21 provided on both sides of the shear deformation restraining and dual support member 12 in the direction perpendicular to the bridge axis. And the bolt 28 is screwed and tightened into the female screw hole 13 of the new base plate 9, and the shear deformation restraining and supporting member 12 is inserted into the new base plate 9. A constant.
[0023]
Thereafter, a high bearing elastic bearing 15 is fitted as a load bearing elastic bearing 15 for supporting the vertical load of the upper structure 7 (6) in the circular hole 16 at the center of the shear deformation restraining and bearing member 12. The lower steel member 29 of the high bearing elastic bearing 15 is placed on the newly installed base plate 9.
[0024]
Here, the configuration of the high bearing elastic bearing 15 will be described. The high bearing elastic bearing 15 prevents only the vertical load from being applied to the elastic layer by preventing the elastic layer from being sheared. By doing so, the thickness of the elastic layer can be reduced, whereby the overall height of the elastic bearing device can be reduced, and the elastic layer can be used at a high bearing pressure. As shown in FIG. 10, for example, as shown in FIG. 10, a lower steel member 29 having a circular bottom surface and a substantially concave cross section and an upper steel member having a substantially circular flat circular cross section and a substantially inverted concave shape are provided. And an elastic body (layer) 25, such as rubber, which is interposed between the steel members 29, 24, is fitted in these recesses, and is integrally fixed with an adhesive or by baking or integral molding. High bearing elasticity that can be replaced The high bearing elastic bearing 15 is removably fitted to the circular hole 16 of the shear deformation restraining and supporting member 12, and is formed by the inner peripheral vertical wall surface 19 with the lower steel member 29. Restricting the relative lateral movement of the upper steel member 24, the elastic body (layer) due to the relative lateral displacement of the upper and lower ends of the elastic body (layer) 25 such as rubber in the high bearing elastic support body 15. Layer 25 is indirectly restrained from shearing deformation. Accordingly, the high bearing elastic bearing body 15 is prevented from laterally moving in the direction perpendicular to the bridge axis and in the bridge axis direction, and the upper steel member 24 is positioned above the shear deformation restraining and supporting member 12 from above. It is provided so as to be slidable in the vertical direction depending on the change in the magnitude of the compression force.
[0025]
The inner peripheral vertical wall surfaces 19 of each circular cross section of the shear deformation restraining and supporting member 12 are arranged on the same circular locus at the center and set to have a similar shape slightly larger than the upper steel member 24. To form a circle. On the inner peripheral vertical wall surface 19 of the shear deformation restraining and supporting member 12, a low friction sliding bearing surface made of a Teflon (registered trademark) layer (ethylene tetrafluoride layer), an ethylene tetrafluoride plate or a layer is appropriately formed. ing. Reference numeral 30 denotes a deformation allowable space for allowing the elastic body (layer) 25 to deform.
[0026]
A circular fitting recess 37 is provided on the upper surface of the upper steel member 24, and a slip bearing member 31 such as an ethylene tetrafluoride plate or an ethylene tetrafluoride layer fits into the fitting recess 37. It is stopped and fixed with an adhesive or the like, or a slip bearing member 31 such as a stainless steel plate is fixed to the upper surface of the upper steel member 24 with a screw or the like. Since the inward annular concave portion is formed on the outer peripheral surface of the intermediate portion of the elastic layer (body) 25, the deformation allowable space 30 can be formed, and the concentration of stress on the outer peripheral edge of the rubber layer is reduced. It is configured to be.
[0027]
In addition, an intermediate portion of the outer surface of the upper steel member 24 is disposed near or in contact with the inner side of the steel shear restraining and supporting member 12, and the steel shear restraining and supporting member 12 is provided. The upper surface level around the penetrating circular hole 16 in 12 is set so as to be located at the middle part of the plate thickness of the upper steel member 24 (in the case of the drawing, the level at the substantially central part of the plate thickness). With such a configuration, even if the upper steel member 24 slightly tilts (rotates) due to the bending of the upper structure 7 including the spar 6, it can be supported while absorbing the tilt.
[0028]
As described above, the high bearing elastic bearing 15 is indirectly locked to the lower structure 2 via the newly provided base plate 9 and the shear deformation restraining and supporting member 12, and is also fixed to the steel shear restraining and supporting member 12. The elastic layer 25 in the high bearing elastic support hole 15 is configured to be non-shear deformable by being directly immovably locked in the horizontal direction.
[0029]
Further, a slip bearing material such as a stainless steel plate is fixed to the lower surface of the upper shoe 27 on the lower surface of the spar 6 as a material having a small friction coefficient with the tetrafluoroethylene plate of the high bearing elastic bearing member 15. (Not shown)
[0030]
In this way, the new base plate 9 and the shear deformation restraining and supporting member 12 and the high bearing elastic support 15 which are installed on the lower structure 2 side are installed, and if necessary, the upper structure 7 side is provided as described above. After installing the sliding member, the jack 8 is shortened, and the lower surface of the upper shoe 27 is placed on the sliding bearing surface (slip bearing member 31) of the upper steel member 24 in the high bearing elastic body 15.
[0031]
Next, the base end side of the upper lifting force holding member 17 made of a rectangular steel plate having the bearing convex portion 22 and the bolt insertion hole 34 of the shear deformation restraining and supporting member 12 is bolted to the bolt hole 34 of the upper lifting force holding member 17. The bolt 32 is fixed to the shear deformation restraining and supporting member 12 while the distal end of the upper lifting force holding member 17 is engaged with the step upper surface 35 on the upper surface side of the upper shoe 27.
[0032]
In this way, the movement of the girder 6 from the upper shoe 27 fixed to the girder 6 in the direction perpendicular to the bridge axis is restricted by the shear deformation restraining and supporting member 12, and the bridge 6 due to a temperature change of the girder 6. With respect to the expansion and contraction in the axial direction, the sliding bearing allows the sliding structure to move in the bridge axis direction due to sliding friction (however, there is a movable type and a fixed type depending on the shape of the upper shoe 27 described later). The bending of the girder 6 due to the vertical load or the like acting thereon is supported by the compression deformation of the high bearing elastic body 15 via the sliding bearing. Also at this time, since the elastic layer 25 of the high bearing elastic body 15 is restrained from shearing deformation, the elastic layer 25 functions as an elastic body that acts only on compressive deformation without shearing deformation. The thin bearing layer can act as a high bearing elastic bearing that can bear high stress per unit area.
[0033]
Further, on both sides of the upper shoe 27 in the direction perpendicular to the bridge axis, side protrusions 39 are provided at the ends in the direction of the bridge axis at intervals in the direction of the bridge axis, and project laterally in the direction perpendicular to the bridge axis. Therefore, the inner distance between the opposing side protrusions 37 is equal to the distance between the support protrusions 22 of the shear deformation restraining and supporting member 12 that is disposed in the side protrusions 37 so as to oppose them. The length is set slightly larger than the length between the front and rear surfaces in the bridge axis direction (in the case shown). As described above, when the size of the support protrusion 22 is slightly increased to the same extent as the dimension between the front and rear surfaces in the bridge axis direction, the fixed end (fixed support point) at which the slip of the sliding support member due to the expansion and contraction of the girder 6 cannot sufficiently occur. ), And by increasing the distance between the side protruding portions 37, a movable bearing (movable fulcrum) for the movable end (movable fulcrum) that can greatly tolerate expansion and contraction of the spar 6 and the like.
[0034]
In the case of the present invention, the shear deformation restraining and supporting member 12 also serving as a side block is detachable by removing a bolt, and can be appropriately replaced with a new shear deformation restraining and supporting member. The high bearing elastic support 15 is also detachable, and can be appropriately replaced with a new high bearing elastic support.
[0035]
With the above configuration, even if the upper steel member 24 is slightly tilted (rotated) due to the bending of the upper structure 7 including the spar 6, the support is performed while absorbing the bending by the compressive elastic deformation of the elastic layer 25. Can be.
[0036]
In practicing the present invention, if the upper shoe 27 or the adjusting plate 40 is fixed to the lower flange of the spar 6 by a set bolt or the like, the upper shoe 27 may be replaced.
[0037]
When the present invention is carried out, the steel girder 6 can be applied to a box girder having a box cross section or another concrete superstructure in addition to a section steel such as an H-section steel. As the lower structure, a structure in which the base plate 1 is fixed to a steel lower structure by bolts instead of anchor bolts can be applied.
[0038]
【The invention's effect】
According to the first aspect of the present invention, a new base plate and a shear deformation restraining and supporting member having a small dimension in the direction perpendicular to the bridge axis are carried in and mounted within the dimension between the existing anchor bolts from the direction perpendicular to the bridge axis. Since the jack-up space for arranging jacks necessary to keep the upper structure such as a girder up-leveled can be secured on the side of the upper surface of the lower structure in the bridge axis direction. When the existing bearing device is repaired, the jack-up space on both sides in the bridge axis direction of the existing elastic bearing device is not hindered.
[0039]
Further, since the repair structure of the present invention utilizes the existing base plate and anchor bolts, it is possible to easily and economically repair the existing bearing device without damaging the upper part of the lower structure. The construction cost can be reduced at a low cost.
[0040]
According to the invention of claim 2, the shear deformation restraining and supporting member can act as a shear deformation restraining member in a bridge axis direction and a direction perpendicular to the bridge axis in the load-bearing elastic bearing body, and the bridge above the base plate can be used. It can be a movement restricting member for the upper structure in the direction perpendicular to the bridge axis disposed on both sides in the direction perpendicular to the axis, and the upper lift stopping member for transmitting the upper lift of the upper structure to the lower structure can be easily provided. The device can be attached to the shear deformation restraining and supporting member, and the device can be made compact.
[0041]
According to the third aspect of the present invention, the new base plate is replaced with the existing base plate only by removing dust and oil from the surface of the existing base plate without processing the existing base plate such as female screws for bolts. Can be fixed easily. In addition, since the shear deformation restraining and supporting member is detachably attached to the new base plate with bolts, if it is necessary to replace the shear deformation restraining and supporting member, it can be easily replaced by removing the bolt. can do. In addition, since the load-bearing elastic bearing is removably fixed within the shear deformation restraining and supporting member, it can be easily replaced similarly to the shear deformation restraining and supporting member.
[0042]
According to the invention of claim 4, in the repair method for repairing the existing bearing device to the elastic bearing device, the upper structure is jacked up and supported by jacks arranged in the bridge axis direction on the lower structure, and After removing the upper part of the bearing device on the existing base plate without removing the base plate and the anchor bolts of the existing bearing device installed on the structure, a pair of bridge axis perpendicular to the bridge axis fixing the existing base plate. A new base plate having a smaller dimension in the direction perpendicular to the bridge axis than the inner gap dimension of the anchor bolts is carried in from the direction perpendicular to the bridge axis and fixed to the existing base plate, and then the pair of anchor bolts is fixed to the new base plate. The shear deformation restraining and supporting member whose dimension in the direction perpendicular to the bridge axis is smaller than the inner clearance dimension After loading and fixing the elastic support for load support in the shear deformation restraint support member, the upper structure is lowered, and the upper structure is supported by the elastic support for load support. As a result, a new elastic bearing is effectively used by effectively using the base plate already installed on the lower structure and the anchor bolts fixing the base plate without damaging the lower structure such as peeling. The device can be installed, and a new base plate, a shear deformation restraining and supporting member and an elastic bearing can be easily installed from a direction perpendicular to the bridge axis while securing jack space in the bridge axis direction. Can be kept low, and the repair cost can be reduced, and the existing bearing device can be repaired with the elastic bearing device.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional front view showing a state in which the present invention is applied to repair an existing bearing device to make it a sliding elastic bearing device.
FIG. 2 is a cross-sectional plan view of FIG. 1 showing a portion below an upper shoe.
FIG. 3 is a longitudinal sectional front view in which the present invention is implemented to repair an existing bearing device to make it a sliding elastic bearing device.
FIG. 4 is a partially cutaway cross-sectional plan view showing a jack arrangement portion and a sliding-type elastic bearing device by notching an upper structure made of a girder.
5A and 5B show a new base plate installed on the base plate in the existing support device, wherein FIG. 5A is a plan view and FIG. 5B is a partially longitudinal front view.
FIG. 6 shows a shear restraint and support member having a shear restraint wall installed on a new base plate and also serving as a support member (side block) in a direction perpendicular to the bridge axis for mounting an upper lift stopping member. (A) is a plan view, and (b) is a partially longitudinal front view.
FIG. 7 is a partially cutaway plan view showing a procedure for repairing an existing bearing device, showing a state of installation of a base plate and an anchor bolt in the existing bearing device left on the lower structure, and showing a girder cutout. It is.
FIG. 8 is a partially cutaway plan view showing a procedure for repairing an existing bearing device, showing a state in which a base plate of a newly installed bearing device is installed on an existing base plate, and showing a girder cutout.
FIG. 9 shows a state in which a shear deformation restraining and supporting member is installed on a newly installed base plate, and a high bearing load supporting device is fitted to the shear deformation restraining and supporting member so as to be mounted on the newly installed base plate. It is a partial cutaway plan view.
10A and 10B show a high bearing elastic bearing used in the present invention, wherein FIG. 10A is an enlarged front view of the high bearing elastic bearing, and FIG. 10B is a plan view of FIG. FIG.
FIG. 11 is a partially longitudinal front view showing an example of a conventional steel bearing device by a seismic intensity method.
[Explanation of symbols]
1 Base plate
2 Concrete substructure
3 Anchor bolt
4 Washer
5 nuts
6 digits
7 Upper structure
8 jack
9 New base plate
10 upward opening
11 Shear key
12 Shear deformation restraint and support member
13 Female thread hole
14 downward opening recess
15 High bearing elastic bearing
16 circular hole
17 Upper lift holding member
18 Female thread hole
19 inner vertical wall
20 Existing bearing device
21 Bolt insertion hole
22 Bearing convex
23 Top
24 Upper steel member
25 elastic layer
26 grooved space
27 Kamitsutsu
28 volts
29 Lower steel member
30 Deformable space
31 Sliding support member
32 Holding member
33 volts
34 bolt hole
35 Step top
36 Side projection
37 Fitting recess
38 Welding
39 Side projection
40 Adjustment plate

Claims (4)

On the existing base plate of the existing bearing device installed on the substructure, the bridge shaft is larger than the inner space in the bridge axis direction between the pair of anchor bolts at the end perpendicular to the bridge shaft that fixes the existing base plate. A new base plate having a small dimension in the direction is carried in from the direction perpendicular to the bridge axis and fixed, and the new base plate has a shear deformation in which the dimension in the bridge axis direction is smaller than the inner space dimension in the bridge axis direction of the pair of anchor bolts. A restraining and bearing member is carried in and fixed from a direction perpendicular to the bridge axis, and a load supporting elastic bearing is installed in the shear deformation restraining member, and an upper structure is supported by the load bearing elastic bearing. A repair structure for an existing bearing device utilizing an existing base plate. The repair structure for an existing bearing device using an existing base plate according to claim 1, wherein the shear deformation restraining and supporting member is a member that also serves as a side block disposed on both sides in a direction perpendicular to the bridge axis. . The new base plate is fixed to the existing base plate by welding, the shear deformation restraining and supporting member is detachably fixed to the new base plate by bolts, and is located in the space formed by the new base plate and the shear deformation restraining and supporting member. The repair structure for an existing bearing device using an existing base plate according to claim 1 or 2, wherein the load bearing elastic bearing body is removably arranged so as to protrude. In the repair method of repairing the existing bearing device to the elastic bearing device, the existing structure installed on the lower structure with the upper structure jacked up and supported by jacks arranged in the bridge axis direction on the lower structure After removing the upper part of the bearing device on the existing base plate without removing the base plate and the anchor bolts in the bearing device, the inner space between the pair of anchor bolts at the end perpendicular to the bridge axis fixing the existing base plate. A newly installed base plate having a dimension in the bridge axis direction smaller than the dimension is carried in from the direction perpendicular to the bridge axis and fixed to the existing base plate. The shear deformation restraint and bearing member with a small dimension in the direction is carried in from the direction perpendicular to the bridge axis and fixed. Then, after the load-bearing elastic bearing is installed in the shear deformation restraint bearing member, the upper structure is lowered, and the upper structure is supported by the load-bearing elastic bearing. Repair method of existing bearing device using existing base plate.

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