JP4040422B2 - Bearing exchange method for existing bearing device and bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a bearing replacement method for replacing an existing bearing device with a type B bearing device and a bearing device.
[0002]
[Prior art]
  Conventionally, when replacing existing support devices such as steel or rubber with type B support type for the purpose of improving the earthquake resistance of existing PC box girders and PC / RC plate girders, it has been difficult in the following points. Yes.
[0003]
  When replacing with a type B support device, the existing anchor cannot be used as it is, so it is necessary to install a new anchor. When drilling vertically from the top surface of the pier, the distance between the pier and the bridge girder is the existing support device. Even if it is jacked up slightly, it is impossible to make an anchor hole (core drilling) longer than the distance between the pier and the bridge girder, and the anchor length is longer than the length between the girder piers. This is the main reason why it is impossible to require a long anchor material. There is another point that is restricted by the shape of the existing pier.
[0004]
  For these reasons, at present, the existing bearing is complemented by combining a newly installed type A bearing device with another falling bridge prevention device. For example, when replacing the existing bearing device 8 made of steel or the like disposed between the pier 1 and the bridge girder 6 as shown in FIG.(1)As shown in FIG. 11b, when a newly installed type A support device 30 and edge widening concrete 31 are integrally provided on both sides of the bridge pier 1 in the bridge axis direction, and the displacement limiting device 32 is installed thereon,(2)As shown in FIG. 11 (c), when installing a newly installed type A support device 30 and a connecting device 34 for connecting the bridge girders 6 composed of girders with a PC steel material 33,(3)As shown in FIG. 11 (d), there are cases in which a PC steel material mounting bracket 35 is provided on each of the pier 1 and the bridge girder 6 and the pier 1 and the bridge girder 6 are connected by the PC steel material 33.
  In addition, the existing bearing on the pier is made into a sliding bearing, and a bracket is attached to the side of the pier, a seismic isolation device is attached to the bracket, and the function is separated into a sliding bearing and a seismic isolation device. There is also known a seismic isolation method for bridges using existing bearings (see, for example, Reference 1).
[0005]
[Patent Document 1]
  Japanese Patent No. 3025177
[0006]
[Problems to be solved by the invention]
  However, in the case of the combination of the type A support device and the fallen bridge prevention device, the fall bridge prevention device is required separately from the type A support device, so that the construction becomes complicated and the construction cost increases. There is a problem.
  In addition, when the existing bearing on the pier is made into a sliding bearing and the seismic isolation device is installed on the bracket fixed to the side of the pier, the seismic isolation device is required separately from the sliding bearing, so the construction becomes complicated, There is a problem that the construction cost becomes high.
[0007]
  An object of the present invention is to provide a method for exchanging an existing bearing device that can be easily replaced with a new type B bearing device at a relatively low cost. It is an object of the present invention to provide a type B support device using an upper arm of the support device.
[0008]
[Means for Solving the Problems]
  In order to solve the above-mentioned problem, in the support device according to claim 1, a new base plate 9 is disposed on the pier 1 from which the main body of the existing support device 8 has been removed, and the new base plate 9 is anchored on the side surface of the pier. It is integrated with the stiffener 18 fixed by bolts and attached to the pier 1,Projecting downward from the bottom surfaceA newly installed upper gutter cover member 10 is arranged on the lower surface of the bridge girder so as to cover the existing upper gutter 7,The newly installed upper eaves cover member includes a horizontal portion made of an upper horizontal steel plate and a lower steel plate,A lateral portion 11 extending in the lateral direction of the newly installed upper heel cover member 10 includes:And placed on the underside of the bridge girderAt a position laterally disengaged from the pier 1, the bridge girder is fixed to the lower surface of the bridge girder by the anchor bolt 23, the newly installed support device 12 is fixed to the newly installed base plate 9, and the upper portion of the newly installed support device 12 is formed on the existing upper gutter cover member 10. It is connected to.
[0009]
  According to a second aspect of the present invention, in the support device according to the first aspect, the existing anchor bolt 20 is fixed to the new base plate 9 by welding, and between the pier 1 and the new base plate 9. The curable material 24 is filled and cured, the new base plate 9 is disposed on the pier 1, and the curable material 24 is placed between the bridge girder 1 and the existing upper gutter cover member 10 so as to embed the existing upper gutter 7. It is filled and cured.
[0010]
  Further, in the method of replacing the existing bearing device according to claim 3, after the main body of the existing bearing device 7 on the pier 1 is removed, a new base plate 9 is installed on the pier 1 and the bridge girder 6 is installed.Projecting downward from the bottom surfaceNewly installed upper fence cover member 10 is placed on the underside of the bridge girder so as to cover the existing upper fence 7The newly installed upper heel cover member has a horizontal portion made of an upper horizontal steel plate and a lower steel plate. e,A lateral portion 11 extending in the lateral direction of the newly installed upper heel cover member 10 is fixed to the lower surface of the bridge girder by an anchor bolt at a position laterally removed from the pier 1, and the newly installed support device 12 is fixed to the newly installed base plate 9. The new base plate 9 is integrated with the stiffener 18 fixed to the side of the pier by anchor bolts 19 and attached to the pier 1, and the new support device 12 is connected to the existing upper eaves cover member 10. It is characterized by that.
[0011]
  According to a fourth aspect of the present invention, the existing anchor bolt 20 on the side of the pier 1 is fixed to the base plate 9 by welding in the method of replacing the existing bearing device according to the third aspect of the invention. Between the bridge girder 6 and the newly installed upper gutter cover member 10 so as to embed the existing upper gutter 7 and to be cured. FeaturesThe
[0012]
DETAILED DESCRIPTION OF THE INVENTION
  Next, embodiments of the present invention will be described in detail with reference to the drawings.
  1 to 9 show an embodiment of the present invention. First, as shown in FIGS. 6 to 8, on both sides 27 of the concrete bridge pier 1 in the direction perpendicular to the bridge axis, an interval is provided in the vertical direction. A plurality of lateral anchor bolt holes 28 extending in the bridge axis direction are provided. The anchor bolt hole 28 is a relatively short anchor bolt hole 28 that does not penetrate the pier 1, and the tip of an anchor bolt 19 (19 a, 19 b) such as a threaded deformed steel rod is inserted into the anchor bolt hole 28. Then, the anchor bolt 19 is fixed to the pier 1 by filling and solidifying the adhesive between the anchor bolt hole 28 and the anchor bolt 19.
[0013]
  Next, the steel bracket 3 is inserted into the respective bolts in the steel bracket 3 in which the bolt insertion holes are provided in the factory or the like in advance in the respective anchor bolts 19. The bracket 3 is fixed to the bridge pier 1 by screwing and tightening the nut 29 to the anchor bolt 19 by directly or evenly contacting the inner side surface of 3 with a mortar or the like interposed therebetween. This steel bracket 3 includes a vertical steel plate 36 having a plurality of through holes for anchor bolts spaced in the vertical and horizontal directions within a width corresponding to the main body of the pier 1 in the bridge axis direction, and a plurality of integral steel plates by welding. The reinforcing vertical ribs 37, and the upper and lower ends of the vertical steel plates 36 and the reinforcing vertical ribs 37 are fixed together by welding to the upper end plate 38 and the vertical steel plates 36 and the lower end portions of the reinforcing vertical ribs 37 by welding. The box-shaped bracket 3 is provided with the bottom plate.
[0014]
  Each of the steel brackets 3 is a wide bracket 3 having a protruding portion 2 protruding so as to protrude from both ends in the bridge axis direction of the bridge pier 1 to the outside in the bridge axis direction. Assembling with a reinforcing stiffener so as to extend in the direction perpendicular to the bridge axis on both ends in the bridge axis direction on the upper surface plate 38 of the projecting projecting portion 2, that is, in the steel brackets 3 arranged to face each other. A steel beam member 4 made of H-shaped steel is installed on the upper surface plate 38 of the steel bracket 3 so as to be detachable by bolts or the like. A total thread PC steel rod 40 is inserted and arranged between the end webs 39 in the direction perpendicular to the bridge axis, and the steel beam members 4 are mutually connected by nuts 41 arranged outside the beam web 39 in the bridge axis direction. Are concatenated.
[0015]
  Then, a jack 5 such as a hydraulic jack is installed on the upper surface of the bracket 3 fixed to the side surface 27 of the pier 1, and the connection with the pier 1 and the connection with the bridge girder 6 in the existing support device 8 are opened. Although not shown in the drawing, a supporting steel plate is interposed between the jack 5 and the bridge girder 6 as appropriate, and the jack 5 is extended to jack up the bridge girder 6 as shown in FIG. 8 with the main body 8 removed and the existing anchor bolt 20 embedded and fixed to the pier 1 left, and the fixed steel upper bar (existing upper bar) 7 left on the bridge girder 6 side of the existing bearing device 8 To do.
[0016]
  In the case where the existing anchor bolt 20 and the existing support device 8 are not detachable by means of a base plate or the like, the existing base plate 42 may be partially heated and melted or gas-cut to remove the existing base plate 42. The anchor bolt 20 and the existing base plate 42 are separated. When the existing anchor bolt 20 is long, it is appropriately cut by fusing or the like, and the head of the existing anchor bolt 20 is cut until the level becomes lower than the upper surface of the new base plate 9 described later. The cutting of the head portion of the existing anchor bolt 20 does not place the existing anchor bolt 20 at a level above the upper surface of the new base plate 9, and a new type B support device 12 is installed on the extension line of the existing anchor bolt 20. Since it is an obstacle to install, it is lowered to a predetermined level. Moreover, the base mortar 43 for the existing support apparatus provided on the upper surface of the pier is removed appropriately.
[0017]
  Next, a new base plate 9 is placed on the upper surface of the pier 1 with a spacer (not shown) interposed as appropriate. The new base plate 9 is provided with a through hole 44 for accommodating the existing anchor bolt 20, and the new anchor plate 20 is disposed in the through hole 44 for accommodating the anchor bolt. The base plate 9 is placed on the upper surface of the pier 1 with appropriate spacers interposed.
[0018]
  The new base plate 9 is made of a rectangular steel plate, and the dimension of the new base plate 9 in the direction perpendicular to the bridge axis is, in this embodiment, the same as or larger than the dimension of the bridge pier 1 in the direction perpendicular to the bridge axis. Welding with vertical stiffeners 18 to be described later, which are formed in slightly larger dimensions and are fixed to both ends of the base plate 9 in the direction perpendicular to the bridge axis by anchor bolts 19a on both sides of the pier 1 in the direction perpendicular to the bridge axis. It is configured so as to facilitate integration by the like. In this way, the newly installed base plate 12 is set to have a length that is about the dimension of the upper surface of the pier 1 (in the illustrated example, the direction perpendicular to the bridge axis), and the newly installed base plate 9 is set to be wide.
[0019]
  Further, the upper end portion of the existing anchor bolt 20 is placed in the through hole of the newly installed base plate 9, or the upper end portion of the existing anchor bolt 20 is appropriately cut, In a state in which the base plate 9 is integrated by welding, a curable material is filled and cured so as to fill a space between the newly installed base plate 9 and the upper surface of the pier 1 to form a pedestal.
[0020]
  In this way, the newly installed base plate 9 is installed on the pier 1, while the lower surface of the concrete bridge girder 6 is installed on the both sides in the direction perpendicular to the bridge axis from the existing upper anchor 7 fixed to the bridge girder 6 and laterally from the pier 1. A plurality of vertical anchor bolt holes 45 are formed at intervals in the bridge axis direction at positions deviated in the direction, and the tip ends of the anchor bolts 23 are disposed in the anchor bolt holes 45 and the anchor bolt holes 45 are disposed in the anchor bolt holes 45. The tip of the anchor bolt 23 is fixed to the anchor bolt hole 45 with an adhesive material.
[0021]
  Next, the lower end portion of the anchor bolt 23 fixed to the lower surface of the bridge girder 6 is inserted into the anchor bolt insertion holes 45 at both ends in the direction perpendicular to the bridge axis of the new existing upper rod cover member 10 so as to cover the existing upper rod 7. Thus, the existing upper heel cover member 10 is held at a predetermined level by the nut 46 screwed into the anchor bolt 23.
[0022]
  The existing upper iron cover member 10 is formed by welding a rectangular steel plate having a substantially constant dimension in the bridge axis direction by welding, a rectangular lower steel plate 47 at the lower end portion, and both ends of the lower steel plate 47 in the bridge axis direction. The vertical steel plates 48 which are arranged so as to be spaced apart from the section in the direction perpendicular to the bridge axis and extended in the bridge axis direction, are erected upward and fixed by welding, and the vertical steel plates 48 Upper cross steel arranged at the upper end so as to extend in the direction perpendicular to the bridge axis so as to be disengaged laterally from the pier 1From the boardIt is comprised by the horizontal part 11 which becomes.
[0023]
  Upper lift stop flanges 16 that extend in the direction perpendicular to the bridge axis and extend in the direction of the bridge axis are integrally connected to both ends of the lower steel sheet 47 in the direction perpendicular to the bridge axis. 8 is formed to have a dimension equal to or larger than the vertical dimension of 8 and can lower the level of the lower steel plate 47 to a level at which the existing upper iron 8 can be covered. 11 is provided with a plurality of anchor bolt holes spaced apart in the bridge axis direction at a position separated from the bridge pier 1 in the lateral direction and separated in the bridge axis direction perpendicularly. ing.
[0024]
  In this manner, the curable material 24 such as a non-shrink mortar is filled between the bridge girder 6 and the existing upper gutter cover member 10 in a state where the existing upper gutter cover member 10 is fixed to the vertical anchor bolt 23. The bridge girder 6 and the existing upper gutter cover member 10 are integrated. In this case, the existing upper rod 7 has a protruding portion 49 projecting in a direction perpendicular to the bridge axis, and is filled with the curable material 24 so as to be embedded, so that it is integrated with the curable material 24. Can improve the integration of the existing upper gutter cover member 10 and the bridge girder 6.
[0025]
  Next, after installing the new base plate 9 on the pier 1 as described above, the steel lower bar 13 in the new rubber support device 12 is placed on the new base plate 9, and the peripheral portion of the steel lower bar 13 The entire circumference is fixed to the newly installed base plate 9 by welding W.
[0026]
  Here, the structure of the new rubber bearing device 12 will be described. The structure of the rubber bearing device is placed on a steel lower bar 13 made of a rectangular steel plate and the steel lower bar 13 in order from the lower part. The elastic body 50 integrated, the steel upper rod 15 mounted on the elastic body 50 and integrated, and the steel lower rod 13 are arranged on both sides in the direction perpendicular to the bridge axis so as to form the bridge shaft. And a side block 14 for restricting lateral movement arranged so as to extend in the direction. In the illustrated example, an uplift stop member 17 is attached to the side block 14. The upper lifting force stopping member 17 may be appropriately attached with another method of lifting the upper lifting force.
[0027]
  The elastic body 50 is formed by alternately laminating rubber layers 53 and reinforcing steel plates (not shown) between an upper steel plate 51 and a lower steel plate 52 that are embedded in an elastic layer such as rubber. A recess for fitting a steel cylindrical shear key is provided on the lower surface of the central portion of the lower steel plate 52 and the upper surface of the central portion of the lower rod 13, and is fitted into these recesses. The shear keys 54 are arranged so as to be relatively immovable in the lateral direction. Similarly to the above, the upper surface of the central portion of the upper steel plate 51 and the lower surface of the central portion of the upper steel rod 15 are provided with recesses for fitting the steel cylindrical shear keys 55. These are integrated so as to be relatively immovable in the lateral direction by a shear key 55 fitted and disposed in the recess.
[0028]
  In addition, a large number of bolt insertion holes 56 are provided at intervals in the periphery of the steel upper rod 15 in the bridge axis direction and the direction perpendicular to the bridge axis, and are inserted into the bolt insertion holes 56. The steel upper bar 15 in the newly installed rubber bearing device 12 is made up of the existing upper bar cover member by a large number of bolts 57 screwed into female screw holes provided in the lower steel plate 47 of the existing upper bar cover member 10. 10 are connected together.
[0029]
  Both ends of the steel lower bar 13 in the direction perpendicular to the bridge axis are made longer than the upper bar 15 in the new bearing device 12, and both end parts in the direction perpendicular to the bridge axis serve as installation spaces for the side blocks 14. In addition, a plurality of female screw holes are provided at intervals in the bridge axis direction and at intervals in the direction perpendicular to the bridge axis.
[0030]
  The side block 14 in the illustrated example is formed of an inverted T-shaped steel block, and the lower flanges 58 arranged so as to extend in the bridge axis direction have a plurality of bolt insertion holes in the direction perpendicular to the bridge axis. It is provided at intervals. Further, a plurality of female screw holes are provided on the upper surface of the support convex portion 59 having a rectangular cross section at the center in the side block 14 at intervals in the direction perpendicular to the bridge axis, and the attachment portion of the upper lift stop member 17 is provided. Is forming. Both side surfaces of the bearing projection 59 in the bridge axis direction are movement limit bearing portions in the bridge axis direction, and an inner side surface of the bearing projection 59 in the direction perpendicular to the bridge axis is a movement limitation bearing portion in the direction perpendicular to the bridge axis. When the inner surface of the side opening groove 22 of the lower steel plate 47 in the existing upper eaves cover member 10 that is opposed to the support protrusion 59 in the lateral direction is engaged, the movement of the bridge girder 6 is restricted.
[0031]
  As described above, after fixing the steel lower bar 13 in the rubber bearing device 12 to the newly-installed base plate 9 by welding, the jack 5 supporting the bridge girder 6 in the jack-up state is shortened, and the bridge girder 6 side The existing upper gutter cover member 10 is placed on the upper surface of the steel upper gutter 15 in the rubber bearing device 12, and the load of the bridge girder 6 is supported by the rubber bearing device 12. Moreover, the support steel plate and the jack 5 which were appropriately interposed between the jack 5 and the bridge girder 6 are removed. Moreover, although the steel bracket 3 for jack installation fixed to the pier 1 is removed at an appropriate time, it can be used as a suitable scaffold until it is replaced with a vertical stiffener 18 described later.
[0032]
  Next, an upper lifting force stopping member 17 having a plurality of bolt insertion holes is disposed at the upper part of the side block 14 in the newly installed bearing device 12, and the tip of the upper lifting force stopping member 17 in the direction perpendicular to the bridge axis is provided. The upper pier cover member 10 is brought into close contact with or brought into contact with the upper surface of the upper lift stop flange 16 to connect the pier 1 and the bridge girder 6 via the new rubber bearing device 12.
[0033]
  Thereafter, the nut 29 fixing the steel bracket 3 is removed, the steel bracket 3 is removed, and then the lateral anchor bolt 19 used to fix the steel bracket 3 is removed. Among them, except for the plurality of anchor bolts 19a at the upper end, the lower anchor bolt 19b is removed by an appropriate means such as fusing, and mortar is filled as necessary.
[0034]
  Thereafter, in order to firmly fix the newly-installed base plate 9 to the pier 1, the vertical stiffener 18 is attached using the anchor bolts 19 a provided on the pier 1 side. The vertical stiffener 18 includes a vertical steel plate 60 and a plurality of steel reinforcing vertical ribs 61 fixed by welding at right angles thereto, and a plurality of anchor bolt holes spaced in the vertical direction. have. The vertical stiffener 18 is disposed at a distance from the direction perpendicular to the bridge axis to the upper portion of the pier 1, and the upper end of the vertical steel plate 60 in the vertical stiffener 18 is connected to both ends of the newly installed base plate 9 in the direction perpendicular to the bridge axis. An anchor bolt 19a provided in advance on the upper portion of the bridge pier 1 is inserted and installed in a plurality of anchor bolt holes of the vertical steel plate 60 in the vertical stiffener 18 so as to contact the lower surface of the section, and the anchor bolt 19a The nut 29 is screwed onto the vertical stiffener 18 and the vertical stiffener 18 is attached to the pier 1.
[0035]
  Thereafter, the upper ends of the vertical steel plates 60 and the vertical ribs 61 of the vertical stiffener 18 and both ends of the new base plate 9 in the direction perpendicular to the bridge axis are fixed by welding continuously in the bridge axis direction. The base plate 9 and the vertical stiffener 18 are firmly integrated, rust-proof coating is applied as necessary, and the replacement of the existing support is completed.
[0036]
  In the above-described embodiment, the newly installed base plate 9 is attached by the stiffener 18 using the side surface of the bridge pier 1 perpendicular to the bridge axis, and the existing upper plate is used using the lower surface of the bridge girder 6 perpendicular to the bridge axis. Although the case where the horizontal portion 11 of the cover member 10 is attached has been described, depending on the shape of the pier 1, construction may not be possible. In this case, the side surface of the pier 1 such as the side surface of the pier in the bridge axis direction is used. Then, the newly installed base plate 9 may be attached, or the existing upper eaves cover member 10 may be attached using the lower surface of the bridge girder 6 in the bridge axis direction. Thus, the anchor bolt 19a can be reliably installed using the side surface of the pier 1 without being trapped by the shape of the pier 1, and the anchor bolt 23 on the girder 6 side for fixing the existing upper eaves cover member 10 is also provided. Is structured so that it can be securely installed vertically from the lower surface of the girder 6 at a position deviated laterally from the pier 1.
[0037]
  In the support structure modified to the type B support device as in the above-described embodiment, regarding the transmission of stress between the pier 1 and the bridge girder 6, the existing upper cover member 10, the new support device 12, and the new base plate 9 , The stiffener 18 and the anchor bolts 19 (19a, 19b), 23 and the curable materials 21, 24, etc., and the existing anchor bolt 20 is fixed to the new base plate 9. The existing anchor bolt 20 can also be used effectively as a stress transmission element. For example, the stress acting on the newly installed base plate 9 is transmitted to the pier 1 through the existing anchor bolt 20 and also transmitted to the pier 1 through the vertical stiffener 18 and the anchor bolt 19 (19a, 19b). The bridge pier 1 can be supported.
[0038]
  In the above embodiment, since the new bearing device is a rubber bearing, the horizontal displacement between the bridge girder 6 and the pier 1 is absorbed by the shear elastic deformation of the rubber and is Even when a lift is applied, the bridge girder 6 and the pier 1 are kept connected, and the bridge girder 6 has a function of preventing relative displacement above a certain level.
[0039]
  Thus, in the illustrated embodiment, the existing anchor bolt 20 can be used effectively by cutting a part of the upper portion of the existing anchor bolt 20 on the pier 1 side in the existing support device 8, and the bridge girder 6 can be used effectively. The existing upper arm 7 on the side can also be used effectively, and the installation space for the side block 14 is provided on both sides of the steel lower arm 13, so that it is modified to a small type B rubber bearing device 12. can do.
[0040]
  When carrying out the present invention, when the bridge girder 6 is a box girder or the like, the lower floor slab of the box girder may be appropriately reinforced with concrete or the like. As the jack 5, a known jack other than the above embodiment may be used. As the beam member 4, an off-the-shelf product such as an H-shaped steel may be used.
[0041]
  In the embodiment of the present invention, an existing bracket 3 or a new bracket 3 made of concrete or the like is fixed in advance on both sides of the bridge pier 1 in the direction perpendicular to the bridge axis, and a jack 5 and a beam are mounted on the bracket 3. The material 4 may be installed and the bridge girder 6 may be jacked up.
[0042]
【The invention's effect】
  According to the first aspect of the present invention, the newly-installed base plate can be attached to the pier integrally with the stiffener fixed by the anchor bolt provided on the side surface of the pier without providing the anchor bolt hole on the upper surface of the pier. Also, place the existing upper gutter cover member in the bridge girder at a position laterally removed from the pierUnderside ofTherefore, it becomes easy to attach the existing upper heel cover member. Further, it is possible to replace the type B support device on the newly installed base plate at a relatively low cost. Also,Projecting downward from the underside of the bridge girderSince the existing upper rod cover member is provided so as to cover the existing upper rod, the existing upper rod cover can be firmly fixed as a sole plate on the bridge girder side even when the existing upper rod is left.
[0043]
  Further, according to the invention of claim 2, since the new base plate is installed in a state where the existing anchor bolt is left on the pier, and the curable material is filled, the existing anchor bolt protrudes on the pier. Even if left, a new base plate can be easily installed.
  In addition, since the existing upper eyelid cover member is provided so as to cover the existing upper eyelid, the existing upper eyelid can be used as a core material, and the existing upper eyelid cover member and the existing upper eyelid are integrated to strengthen the existing upper eyelid cover. In addition, since the existing upper eaves cover member is fixed to the bridge girder, the existing upper eaves cover member can be firmly fixed to the bridge girder as the sole plate. Also, by filling the pier and the new base plate with a curable material and integrating the pier and the new base plate, the new base plate can be installed in a stable state on the pier, improving the seismic performance. it can.
  Furthermore, if the existing anchor bolts are fixed to the new base plate by welding or the like, the existing anchor bolts can be used effectively, and the new base plate and the existing anchor bolts can be firmly integrated, Even if the lifting force is applied, the intermediate portion of the newly installed base plate can be firmly supported so as not to float, and the stress can be transmitted from the bridge girder to the pier via the existing anchor bolt.
[0044]
  Further, according to the bearing replacement method of the existing bearing device of claim 3,Projecting downward from the underside of the bridge girderSince the existing upper rod cover member is provided so as to cover the existing upper rod, the existing upper rod cover can be firmly fixed as a sole plate on the bridge girder side even when the existing upper rod is left.
  In addition, since the new base plate is integrated with the stiffener fixed to the pier, the new base plate can be easily and firmly fixed to the pier.
  In addition, the lateral part that extends in the lateral direction of the existing upper heel cover memberWhile placed on the underside of the bridge girderIt can be firmly fixed with anchor bolts that can be securely installed at a position laterally away from the pier, and the new base plate can also be firmly fixed to the pier with anchor bolts that can be securely installed on the side of the pier.
  In addition, it can be easily installed on a type B support device without using a separate type A bridge support device that requires a separate fall prevention device, etc., as compared with the conventional case, and it requires a relatively short construction period and reduces construction costs. It is possible to exchange the bearings.
[0045]
  According to the support exchanging method of claim 4 of the present invention, since the newly installed base plate is fixed to the existing anchor bolt by welding, the existing anchor bolt can be used effectively, and the newly installed base plate and the existing anchor bolt are firmly It can be integrated into the bridge base and can be firmly supported so that the newly installed base plate does not float up even if the lifting force is applied, and stress can be transmitted from the bridge girder to the pier via the existing anchor bolts. Can do.
  In addition, since the curable material is filled between the bridge girder and the newly installed upper fence cover member so as to embed the existing upper fence, and the existing upper fence cover member is provided so as to cover the existing upper fence, It can be used as a core material, and the existing upper rod cover member and the existing upper rod can be integrated to strengthen the existing upper rod cover, and the existing upper rod cover is fixed to the bridge girder. It can be firmly fixed to the bridge girder as a sole plate. In addition, curable material is filled between the pier and the new base plate, and the pier and the new base plate are integrated, so the new base plate can be installed on the pier in a stable state, improving the seismic performance. Can do.
[Brief description of the drawings]
FIG. 1 is a partially longitudinal front view showing a state in which an existing steel bearing is replaced with a type B rubber bearing device as seen from the bridge axis direction according to an embodiment of the present invention. .
FIG. 2 is a partially longitudinal side view of FIG. 1 viewed from a direction perpendicular to the bridge axis.
FIG. 3 is a partially longitudinal side view of FIG. 1 with the vertical stiffener removed, as viewed from the direction perpendicular to the bridge axis.
4 is a cross-sectional view taken along line AA in FIG.
5 is a cross-sectional view taken along line BB in FIG.
6A is a partially longitudinal schematic front view showing a state in which brackets are fixed to both side surfaces of the bridge pier in a direction perpendicular to the bridge axis, a beam member is installed between the brackets, and a jack is installed. FIG. FIG. 2 is a schematic side view of (a).
FIG. 7 is a partially longitudinal front view showing a state in which an anchor bolt and a bracket are installed on a bridge pier and a jack is arranged on the bracket.
FIG. 8 is a partially longitudinal front view showing a state in which a bridge girder is jacked up and removed except for an anchor bolt and an existing upper rod in an existing bearing.
FIG. 9 is a partially longitudinal front view showing a state in which a new base plate is installed on a bridge pier, a new support device is installed, and an existing upper eaves cover member is installed on a bridge girder.
[Fig. 10] Install the new base plate on the pier, install the new support device, install the existing upper cover member on the bridge girder, lower the bridge girder, and place the existing upper cover member on the new support device It is a partially longitudinal front view which shows the state put.
FIG. 11 shows a schematic side view of a form of improvement from a conventional steel bearing, in which (a) is a conventional steel bearing before improvement, and (b) is a displacement limiter The case where it is set as a combination is shown, (c) shows the case where the girders are connected with PC steel, and (d) shows the case where the bridge pier and the bridge girder are connected with PC steel to make a falling bridge prevention device.
[Explanation of symbols]
1 Pier
2 Overhang projecting outward in the bridge axis direction
3 Bracket
4 Beam material
5 Jack
6 Bridge girder
7 Existing upper arm
8 Existing bearing device
9 New base plate
10 Existing upper cover member
11 Horizontal part
12 New support device
13 Shimojo
14 Side block
15 upper arm
16 Upper lift stop flange
17 Upper lift stop member
18 Vertical stiffener (stiffener)
19 Anchor bolt
20 Existing anchor bolt
21 Curable material
22 Side opening groove
23 Anchor bolt
24 Curable material
25 Movement restriction support
27 Side of the bridge axis perpendicular direction
28 Anchor bolt hole
29 nuts
30 New type A bearing device
31 Edge widened concrete
32 Displacement limiting device
33 PC steel
34 Connecting device
35 PC steel bracket
36 Vertical steel plate
37 Reinforced vertical ribs
38 Top plate for beam support
39 Web
40 Total thread PC steel bar
41 nut
42 Existing base plate
43 Pedestal mortar for existing bearing devices
44 through holes
45 Anchor bolt hole
46 nuts
47 Rectangular lower steel plate
48 Vertical steel plate
49 Protrusion
50 Elastic body
51 Upper steel plate
52 Lower steel plate
53 Rubber layer
54 Shear key
55 Shear key
56 Bolt insertion hole
57 bolts
58 Flange
59 Supporting convex part
60 Vertical steel plate
61 Vertical rib

Claims (4)

Existing bearing apparatus main establishment of the base plate is arranged in the removal has been on piers of the newly established base plate is mounted is integral with the stiffener, which is fixed by anchor bolts to the piers side a pier, from the lower surface of the bridge beam A newly installed existing upper eaves cover member is disposed on the lower surface of the bridge girder so as to cover the existing upper eaves protruding downward, and the newly installed existing upper eaves cover member includes a lateral portion made of an upper transverse steel plate and a lower steel plate, The laterally extending lateral part of the newly installed upper eaves cover member is located on the underside of the bridge girder and fixed to the underside of the bridge girder with anchor bolts at a position that is laterally removed from the bridge pier, and is newly installed on the newly installed base plate. And the upper part of the new support device is connected to the existing upper cover member.   An existing anchor bolt is fixed to the new base plate by welding, a curable material is filled and cured between the pier and the new base plate, the new base plate is arranged on the pier, and the existing upper plate The bearing device according to claim 1, wherein a curable material is filled and cured between the bridge girder and the existing upper eaves cover member so as to embed the frame. After removing the main body of the existing support device on the pier, install the new base plate on the pier and cover the existing upper ridge cover member that projects downward from the lower surface of the bridge girder. The newly installed upper upper cover member has a horizontal portion made of an upper horizontal steel plate and a lower steel plate, and the horizontal portion of the new existing upper steel cover member that extends in the lateral direction is arranged on the lower surface of the bridge girder. fixed by anchor bolts to the girder lower surface at a position deviated laterally from the piers with, set up a bearing device newly established base plate of the new, and stiffener base plate of the newly secured by anchor bolts a pier side A method for exchanging a bearing for an existing bearing device, wherein the bearing device is integrated and attached to a pier, and a new bearing device is connected to an existing upper eaves cover member.   The existing anchor bolts on the pier side are fixed to the base plate by welding, and a curable material is filled between the pier and the new base plate to be hardened, and the existing girder and the existing upper gutter cover member are embedded so as to embed the existing upper gutter. 4. A method for exchanging a bearing for an existing bearing device according to claim 3, wherein a curable material is filled between and cured.

Images