JP2009019493A - Renewal method and renewal structure for existing bearing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a renewal method and a renewal structure for an existing bearing apparatus. <P>SOLUTION: In this renewal method for the existing bearing apparatus, the existing bearing apparatus on a lower structure 4 is removed, and a new bearing apparatus is installed. A groove 15 not chipping an internal reinforcement bar 14 of an existing concrete beam 1 is provided in a side surface 12 or a lower surface 13 of the existing concrete beam 1, an engagement metal fitting 24 is provided on the existing concrete beam 1 so that a projection 22 in the engagement metal fitting 24 having the projection 22 fitted to the groove 15 is fitted to the groove 15, and the existing concrete beam 1 is supported on a new bearing apparatus 21 through the engagement metal fitting 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a renewal method of a bearing in which an existing bearing device in an elevated road bridge or bridge is removed and a new bearing device is installed. Renewal method and structure of existing bearing device supported by the bearing device, and in particular, an engagement metal provided with a shallow groove that does not connect the internal rebar to the side of the existing concrete girder and having a protrusion that fits into this groove The present invention relates to a renewal method and a renewal structure of an existing support device in which a new support device is installed with tools interposed.

Conventionally, when exchanging a bearing device, for example, a steel or elastic bearing device by a seismic intensity method in which a base plate is fixed to a lower structure with an anchor bolt is replaced with a bearing device such as a type B steel or elastic bearing device (Patent Document 1). Or it is known to replace it with non-patent document 1).
JP 2004-3000897 A Road Bridge Specification (V Seismic Design) Published by Japan Road Association, 14 April 2002, p. 245

When installing a new bearing device whose seismic performance has been enhanced by the existing strength method and supporting an existing concrete girder, the horizontal force is greater than that designed for the connection structure between the existing concrete girder and the existing sole plate. Or, since a new bearing device designed on the assumption that the lifting force will act will be installed, the connection between the existing concrete girder and the new bearing device will be made more reliable, It is necessary to connect a new bearing device with a structure capable of transmitting a higher load to a horizontal force or a lifting force, alone or in combination with other devices.
When the existing girder is made of steel as described above, it is easy to reinforce by building up a welded portion or the like when fixing the sole plate, but when the existing girder is a concrete girder, It is difficult to easily increase the strength of the engagement portion with an anchor bolt or the like with an existing concrete girder.
It is an object of the present invention to provide an updating method and an updating structure for an existing bearing device that can make an engaging portion between an existing concrete girder and a new bearing device a more reliable engaging portion by simple means. Objective.

In order to solve the above-mentioned problem, in the renewal method of the existing support device of the first invention, in the renewal method of the existing support device in which the existing support device on the lower structure is removed and a new support device is installed. A groove in a state that does not connect the internal reinforcing bar of the existing concrete girder is provided on the side surface or the lower surface of the concrete girder, and the projection in the engagement fitting having a projection that fits into the groove is fitted into the groove. As described above, the engaging metal fitting is provided on an existing concrete girder, and the existing concrete girder is supported by a new support device via the engaging metal fitting.
Further, in the renewal method of the existing bearing device of the second invention, in the renewal method of the existing bearing device in which the existing bearing device on the lower structure is removed and a new bearing device is installed, the side surface of the existing concrete girder or Provided on the lower surface is a groove that does not connect the internal reinforcing bar of the existing concrete girder, and the projection group in the engagement fitting having a projection group consisting of a plurality of projections that fit into the groove is fitted into the groove. The engaging metal fitting is provided on the existing concrete girder so that at least the groove and the projection group are fixed by an adhesive or a curable filler such as a non-shrinking mortar. The existing concrete girder is supported by the newly installed support device through the engagement fitting.
Further, in the third invention, in the renewal method of the existing bearing device of the first invention, the existing concrete girder and the engagement fitting are such that at least the groove and the projection are curable fillers such as an adhesive or non-shrink mortar. It is characterized by being fixed by.
According to a fourth aspect of the present invention, in the renewal method for an existing bearing device according to the first or third aspect of the invention, the groove is a groove that is inclined in the horizontal direction or the vertical direction. Or it is a protrusion inclined in the up-down direction.
In the fifth invention, in the renewal method of the existing bearing device of any one of the first invention to the fourth invention, the groove is a thickness range of the cover concrete or a groove having a depth exceeding the thickness of the cover concrete, Correspondingly, the protrusion is a protrusion having a protrusion length exceeding the thickness range of the cover concrete or the thickness of the cover concrete.
Moreover, in the update structure of the existing support apparatus of 6th invention, in the renewal construction method of the existing support apparatus which removes the existing support apparatus on a lower structure and installs a new support apparatus, the side surface of the existing concrete girder or Provided on the lower surface is a groove that does not connect the internal reinforcing bar of the existing concrete girder, and the engagement metal fitting is provided so that the protrusion in the engagement metal fitting provided with the protrusion fitted into the groove is fitted into the groove. An existing concrete girder is provided on an existing concrete girder, and the existing concrete girder is supported by a new support device through the engagement fitting.
Moreover, in the update structure of the existing support apparatus of 7th invention, in the renewal construction method of the existing support apparatus which removes the existing support apparatus on a lower structure and installs a new support apparatus, the side surface of the existing concrete girder or Provided on the lower surface is a groove that does not connect the internal reinforcing bar of the existing concrete girder, and the projection group in the engagement fitting having a projection group consisting of a plurality of projections that fit into the groove is fitted into the groove. An engagement metal fitting is provided on an existing concrete girder so that the existing concrete girder and the engagement metal fitting are fixed to each other by at least the groove and the projection group by a curable filler such as an adhesive or a non-shrink mortar, An existing concrete girder is supported by a new support device through the engagement fitting.
According to an eighth aspect of the present invention, in the renewal structure of the existing bearing device of the sixth aspect, at least the groove and the protrusion are fixed to each other by the curable filler such as adhesive or non-shrink mortar. It is characterized by being.

According to the first and sixth inventions, an existing concrete girder can be easily formed by providing a groove in an existing concrete girder, and interposing an engagement metal fitting having a protrusion between the existing concrete girder and a support device. The engagement of the engagement metal fitting can be enhanced, the engagement between the engagement metal fitting and the support device can be enhanced, and consequently the engagement between the existing concrete girder and the support device can be enhanced.
In particular, in the present invention, since the internal reinforcing bars in the existing concrete girder are not cut, on-site processing of the existing concrete girder can be greatly facilitated, and the connection structure between the existing concrete girder and the engagement metal fitting Even simple and reliable.
According to the second and seventh inventions, the existing concrete girder is provided with a groove, and the engaging metal fitting having a plurality of projections is interposed between the existing concrete girder and the support device, so that the existing concrete girder is made. The girder and the engagement fitting are easily integrated with the existing concrete girder and the engagement fitting simply by fixing at least the groove and the projection group with a curable filler such as an adhesive or non-shrink mortar. In particular, the protrusions can be loosely fitted in the groove and integrated with a curable filler such as an adhesive or non-shrink mortar, so the shape of the groove is simplified to a continuous groove. Since the entire projection group only needs to be arranged in the groove, the construction at the site is simple and the construction can be easily performed in a short construction period.
In particular, in the present invention, since the internal reinforcing bars in the existing concrete girder are not cut, on-site processing of the existing concrete girder can be greatly facilitated, and the connection structure between the existing concrete girder and the engagement metal fitting Even simple and reliable.
Further, according to the third invention or the eighth invention, since the existing concrete girder and the engagement fitting are at least the groove and the protrusion are fixed by a curable filler such as an adhesive or a non-shrink mortar, Simply filling the existing concrete girder with the engagement bracket by simply filling the gap between the groove on the existing concrete girder and the protrusion on the engagement bracket side with a curable filler such as adhesive or non-shrink mortar, Can be connected with improved seismic performance. In addition, the structure is integrated by filling the groove and the protrusion with a curable filler such as an adhesive or non-shrink mortar, so that the structure is simple and can be reliably connected.
According to the fourth aspect of the present invention, when the groove and the protrusion are inclined in the lateral direction, the engagement and integration in both the bridge axis direction and the bridge axis perpendicular direction can be achieved.
Further, when the groove and the protrusion are inclined in the vertical direction, an engagement structure that can resist the upward lifting force in the vertical direction and the horizontal force in the bridge axis direction can be provided.
When the groove and the protrusion are both inclined in the horizontal direction and in the case of being inclined in the vertical direction, the uplift force in the vertical direction and the horizontal force in the horizontal direction are It can be set as the connection structure which can resist both.
Further, according to the fifth invention, a groove having a depth dimension within the cover thickness, or a groove having a dimension deeper than the diameter of the reinforcing bar, for example, is formed as a groove. Well, it can be easily processed at a low cost on the existing concrete girder side. In addition, a groove having a deep dimension toward the inside of the stirrup muscle or the main muscle is disposed, and when the protrusion tip is located in the projection plane in the bridge axis direction or the vertical direction of the stirrup muscle or the main muscle, the protrusion tip is The integration of the laterally or vertically grooved girders 1A and the engagement fittings 24 can be made more reliable than in the case of positioning only in the cover concrete.

  Next, the present invention will be described in detail with reference to the illustrated embodiments.

  First, referring to FIG. 15, one form of a state in which an existing concrete girder 1 as an upper structure is supported will be described. In FIG. 15, the existing concrete girder 1 has a sole plate 2 at a lower part thereof. The sole plate 2 is mounted on an existing bearing device 6 fixed by the anchor bolt 3 and fixed on the concrete lower structure 4 by the anchor bolt 5, and one side of the sole plate 2 engages with the sole plate 2. The existing concrete girder 1 is supported by fixing the other side of the upper lifting stopper 7 to a vertical portion 9 erected from the lower base plate 8 with a bolt or the like. Further, as shown in FIG. 19A, the state in which the existing concrete girder 1 is supported is a state in which the elastic bearing body 10 is interposed between the existing concrete girder 1 and the lower structure 4. It is.

  When the sole plate 2 fixed to the existing concrete girder 1 is used from the state shown in FIG. 15, the existing support device 6 and the upper structure are left in the state where the sole plate 2 remains as shown in FIG. In the state where the connection with the girder 1 or the lower structure 4 as a thing by a nut or a bolt is released, the existing concrete girder 1 is jacked up as appropriate, or the existing bearing device 6 is removed, or FIG. 16 (b) As shown in FIG. 4, the anchor bolt 3 on the side of the existing concrete girder 1 and the sole plate 2 are disconnected by fusing or the like and removed to the sole plate 2, and then the upper portion of the lower structure 4 is sandwiched to form the recess 11. Provide. Further, from the state of FIG. 19A, as shown in FIG. 19B, the existing support device 6 is removed, the upper portion of the lower structure 4 is suspended, and the recess 11 is provided.

In addition, the existing concrete girder 1 is provided on both side surfaces 12 or the lower surface 13 of the existing concrete girder 1 in the direction of the bridge axis at the end of the bridge axis direction or on both sides 12 and the lower surface 13 of the existing concrete girder 1. In order to avoid cutting the reinforcing bars 14 such as the main bars or stirrup bars that are embedded and fixed, exploration of the reinforcing bars as appropriate, the cover concrete thickness range or cover concrete thickness is about the diameter of the reinforcing bars (stirrup bars or main bars) Beyond, the concrete between the reinforcing bars is provided, and grooves 15 (15A to 15C) having a form as shown in FIGS. 4 (a) to 4 (g) are provided.
In the present invention, as described above, by providing the groove 15 so as not to cut the reinforcing bar in the existing concrete girder 1, the processing on the existing concrete girder 1 side is only a concrete lifting operation, so that the on-site processing can be performed. Easy to do. As the suspension device, the groove 15 may be provided by an electric cutter or the like, or the groove may be provided by a known suspension device or the like.

  Next, the typical form of the groove | channel provided in the side surface or lower surface of the existing concrete girder 1 is demonstrated.

In the form shown in FIG. 4 (a), the vertical rib 16 is opened at the bottom of the side of the existing concrete girder 1 at the bottom of the side of the existing concrete girder 1 and opened at the side of the girder around the position of the longitudinal rib 16 on the girder 1 side. In this embodiment, a plurality of grooves 15a are provided in parallel with an interval. In the embodiment of FIG. 4B, a plurality of lateral grooves 15b extending in the bridge axis direction from a position away from the beam end are provided with an interval in the vertical direction. In FIG. 4 (c), the vertical grooves 15a and the horizontal grooves 15b are provided in a lattice shape, and in FIG. 4 (d), the central axis of the position of the vertical rib 16 of the beam 1 is the center. Thus, a plurality of parallel first longitudinally inclined grooves 15c inclined so as to approach each other and a plurality of second vertically inclined grooves 15d inclined symmetrically thereto are provided at intervals. . In FIG. 4 (e), a plurality of parallel first longitudinally inclined grooves 15c that incline so as to be separated toward the lower part around the central axis of the position of the longitudinal rib 16 of the spar 1 are inclined symmetrically. In this embodiment, a plurality of second longitudinally inclined grooves 15d are provided in parallel at intervals.
Further, in FIG. 4 (f), one or a plurality of circular grooves 15e spaced in the vertical direction are provided in the lower part of the side surface of the beam 1 in the form of a large number of rows spaced in the longitudinal direction of the beam. In (g), the circular grooves 15e are provided in a staggered manner.

Further, when the bottom plate 2 of the existing concrete girder 1 is removed and the lower part of the anchor bolt 3 fixedly embedded in the existing concrete girder 1 is removed as necessary, FIG. 9 (a) (c) 10 (e), 11 (g) (h), and 12 (k) (m), it is possible to provide a groove on the lower surface of the existing concrete girder 1 as shown in a typical form. .
FIG. 9A shows a form in which a plurality of vertically long grooves 15f are provided on the bottom surface of the end portion of the existing concrete girder 1 in the bridge axis direction, extending in the bridge axis direction and spaced in the direction perpendicular to the bridge axis. In 9 (c), a plurality of horizontally long grooves 15g extending in the direction perpendicular to the bridge axis are provided at intervals in the bridge axis direction. In FIG. 10 (e), the vertically long groove 15f and the horizontally long groove 15g are provided so as to intersect with each other. In FIG. 11 (g), it is inclined with respect to the central axis extending in the bridge axis direction, and In this embodiment, a longitudinally inclined groove 15h is provided so that adjacent grooves are gradually separated from each other toward the center axis extending in the bridge axis direction. In FIG. 11 (i), the groove is directed toward the center axis extending in the bridge axis direction. In this embodiment, a vertically inclined groove 15h that is inclined so that adjacent grooves gradually approach each other is provided. For example, as described above or as described later, the existing concrete girder 1 is processed into a grooved girder 1A.

  Next, a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, a recess 11 and a new anchor bolt hole 17 are provided in the lower structure 4, and a non-shrink mortar 19 is filled with the new base plate 18 adjusted in level, and fixed by an anchor bolt. To do. The new base plate 18 is provided with a through hole for receiving the anchor bolt head, and the existing anchor bolt 5 head or the new anchor bolt 20 head is received and welded or the like so as to accommodate the existing anchor bolt 5 or the new anchor bolt 20. The head and the newly installed base plate 18 are integrated.
A new support device 21 having a shear restraint wall or the like is installed on the new base plate 18 fixed in this manner, and fixed to the new base plate 18 by welding or bolts.

  Next, as shown in FIG. 4 (a) and FIG. 16 (b), when the longitudinal groove 15a is provided in the end side surface 12 of the existing concrete girder 1, FIG. 5 and FIG. ), A protrusion 22a made of a longitudinal steel plate extending in a direction perpendicular to the bridge axis is fixed at a position corresponding to the longitudinal groove 15a by welding or a bolt (not shown) at intervals in the bridge axis direction. The engagement metal fitting 24 is configured by fixing the side engagement member main body 23 to the steel substrate 25 of the engagement metal fitting 24 by welding when the engagement metal fitting 24 is attached to the grooved beam 1A. A reinforcing vertical rib 26 is provided on the outer side of the side engaging member main body 23 in the direction perpendicular to the bridge axis to reinforce.

The engaging bracket 24 is placed on the substrate 25 with the grooved girder 1A in a state where the lower side including the substrate 25 is placed on the upper part of the new support device 21 installed on the lower structure 4. The position of the side engaging member main body 23 in the direction perpendicular to the bridge axis is adjusted to a position where the protrusion 22a in the side engaging member main body 23 sufficiently enters and engages with the groove 15a and is welded to the substrate 25 (illustrated). ) Or with bolts. As will be described later, even if the protrusion of the engagement fitting 24 is fitted in the groove 15 of the grooved beam 1A in the jacked-up state, the engagement fitting 24 is placed on the new support device 21. And you may make it fit a groove | channel and protrusion so that the grooved girder 1A may be dropped on it.
Between the protrusion 22a of the side engaging member main body 23 and the groove 15a in the grooved beam 1A, if necessary, the base is treated and filled with an adhesive, or the side engagement including the protrusion 22a is performed. The girder side surface of the member main body 23 and the entire surface of the grooved girder 1A with which the side engaging member main body 23 abuts may be appropriately ground-treated and applied with an adhesive so as to be engaged integrally. . Alternatively, instead of these, a curable filler such as a non-shrink mortar may be filled and engaged integrally.

When it is not necessary to integrate the substrate 25 and the new support device 21 in the vertical direction, as shown in FIG. 1, the substrate 25 is placed on the new support device 21 formed of a sliding support, You may make it provide the constraining wall 27 which restrains a movement to a bridge axis orthogonal direction on both sides of the bridge axis orthogonal direction of the board | substrate 25. FIG.
In the embodiment shown in FIG. 1, an elastic body 40 in which upper and lower steel plates of an elastic layer 36 are integrally fixed is disposed in a shear restraint wall 42 in a lower support member 41, and the lower support member 40 is formed by a plurality of bolts 43 by a base plate 18. It is fixed to.
Further, when integrating the base plate 25 and the new support device 21 in the vertical direction, as shown in FIG. 18A, the base plate 25 and the upper portion of the new support device 21 are fixed by welding. As shown in FIG. 18B, when the new bearing device 21 is an elastic bearing device having upper and lower mounting steel plates, the board 25 and the upper mounting steel plate 28 of the new bearing device 21 are used. May be fixed by a bolt 28a. The lower mounting steel plate 29 may be fixed to the newly installed base plate 18 by welding or bolts.

  When the new base plate 18 is fixed to the new anchor bolt 20, a bolt 32 having a head flange 31 with a rotating tool engaging portion and a female screw at the lower portion is provided at the upper portion of the new anchor bolt 20. The new base plate 18 can be fixed to the new anchor bolt 20 by being inserted through the shaft portion insertion hole.

  Next, the case of the other form of the groove | channel provided in the grooved girder 1A is demonstrated.

  As shown in FIG. 4 (b), in the case where a plurality of lateral grooves 15b extending in the bridge axis direction are provided on the side surface of the end portion of the existing concrete girder 1 at intervals in the vertical direction, ), The side engaging member main body 23 having the protrusions 22b made of a plurality of lateral steel plates extending in the bridge axis direction at intervals in the vertical direction is fixed to the substrate 25 by welding or bolts. The engagement member 24 may be installed as shown in FIG.

  Further, as shown in FIG. 4 (c), a plurality of lateral grooves 15b extending in the bridge axis direction in parallel with an interval in the vertical direction are formed on the side surface of the end portion of the existing concrete girder 1 and the gap in the bridge axis direction. In the case where a plurality of vertical grooves 15a extending in the vertical direction in parallel are provided in a lattice shape, as shown in FIG. 7 (f), a plurality of parallel grooves extending in the bridge axis direction at intervals in the vertical direction are provided. 7b and a side engaging member main body 23 having a protrusion 22a extending in the vertical direction in parallel with a gap in the bridge axis direction are fixed to the substrate 25 by welding or bolts, as shown in FIG. As shown, the engaging member 24 may be installed below the grooved beam 1A.

  Further, as shown in FIGS. 4D and 4E, an engagement groove including a plurality of first vertical inclined grooves 15c and second vertical inclined grooves 15d that are inclined toward and away from each other toward the lower portion. 7 (h) and (j), a plurality of first inclined protrusions 22c and second inclined protrusions 22d that are inclined toward and away from each other toward the lower part are provided. The side engaging member main body 23 may be fixed to the base plate 25 by welding or bolts, and the engaging member 24 may be installed below the grooved beam 1A as shown in FIGS. FIG. 14A shows a state in which the side engaging member main body 23 provided with the first inclined protrusions 22c and the second inclined protrusions 22d on the substrate 25 is arranged on the substrate 25. FIG.

  Further, as shown in FIGS. 4 (f) and 4 (g), a plurality (two in the illustrated case) of circular grooves 15 e spaced in the vertical direction are provided in the lower part of the side surface of the beam 1, and the spaces in the longitudinal direction of the beam. 8 (l) (n), as shown in FIGS. 8 (l) and 8 (n), in the vertical portion 23a of the side engaging member main body 23, A side engaging member body 23 provided with rod-like protrusions 22f having a circular cross section spaced in the vertical direction and parallel to a plurality of rows spaced in the longitudinal direction of the beam or in a staggered manner is welded or bolted to the substrate 25. Then, as shown in FIGS. 8 (k) and 8 (m), the engaging member 24 may be installed below the grooved beam 1A. FIG. 14B shows a state in which the side engaging member main body 23 having a large number of circular protrusions 22 f is arranged on the substrate 25.

  Next, a case where a horizontal groove is provided on the lower surface of the existing concrete girder 1 to form a grooved girder 1A and an engagement member having a protrusion fitted in the groove is combined with FIG. 9 to FIG. The description will be given with reference.

  FIG. 9 (a) shows the bottom surface of the grooved girder 1A, which extends in the bridge axis direction to the bottom surface of the end of the existing concrete girder 1 and extends in parallel at intervals perpendicular to the bridge axis. 9 (b) shows a plurality of protrusions 22i that can be fitted into the grooves 15f, extending in the direction of the bridge axis and extending in parallel at intervals perpendicular to the bridge axis. This is a form of the engaging member 24 in which the engaging protrusion 22i is fixed to the substrate 25 by welding or the like.

  FIG. 9 (c) shows the bottom surface of the grooved girder 1A. The bottom surface of the existing concrete girder 1 is extended in a direction perpendicular to the bridge axis, and a plurality of parallel beams are spaced apart in the bridge axis direction. FIG. 9D shows a projection 22j that can be fitted in the groove 15g, extending in the direction of the bridge axis and spaced at a right angle to the bridge axis. This is a form of an engaging member 24 in which a plurality of engaging protrusions 22j extending in parallel are fixed to a substrate 25 by welding or the like.

  FIG. 10 shows the bottom surface of the grooved girder 1A. On the bottom surface of the end of the existing concrete girder 1, there are a plurality of grooves 15f extending in the bridge axis direction and parallel to each other at intervals in the direction perpendicular to the bridge axis. FIG. 10 (f) shows a configuration in which a plurality of grooves 15g that intersect with each other and extend in a direction perpendicular to the bridge axis and that are parallel to each other at intervals in the bridge axis direction are released on both sides of the beam. A plurality of projections 22i that can be fitted in the groove 15f and extend in the bridge axis direction with a gap therebetween, and are arranged so as to intersect the projections 22i with a plurality of projections 22i in parallel with a gap in the direction perpendicular to the bridge axis. A plurality of engaging protrusions 22i that can be fitted to 15g and extend in a direction perpendicular to the bridge axis and that are parallel to each other at intervals in the bridge axis direction are fixed to the substrate 25 by welding or the like to form an engagement fitting 24. It is a form.

  11 (g) and 11 (h), laterally inclined grooves 15 k that are inclined so as to approach each other toward the central axis in the bridge axis direction are formed in the circumferential direction in the lower surface of the end of the existing concrete girder 1 in the bridge axis direction. In a form in which a plurality of angular intervals (in the case of illustration, an equal angular interval of 90 degrees) are provided, a rectangular arrangement in FIG. 11 (g) and an x-shaped (radial) arrangement in FIG. 11 (i). This is a form provided. 11 (h) and 11 (j) are inclined projections 22k that can be fitted into the groove 15k, and a plurality of (four in the illustrated case) are provided at equal angular intervals (90 degrees in the illustrated case) around the horizontal. ) A plurality of engaging protrusions 22k arranged in a rectangular shape or arranged in an X shape are fixed to the substrate 25 by welding or the like to form the engagement fitting 24.

  12 (k) and 12 (m), a large number of circular grooves 15e are arranged on the lower surface of the end of the existing concrete girder 1 in the bridge axis direction at intervals in the bridge axis direction and the direction perpendicular to the bridge axis (FIG. 12 ( k)) or a staggered arrangement (in the case of FIG. 12 (m)). 12 (l) and 12 (n) are cylindrical protrusions 22e that can be fitted into the circular groove 15e, and are arranged in an aligned arrangement (in the case of FIG. 12 (k)) or in a staggered arrangement (in the case of FIG. 12 (m)). A plurality of engaging cylindrical protrusions 22e are fixed to the substrate 25 by welding or the like to form an engagement fitting 24.

  As a combination form of the groove 15 and the protrusion 22, a combination of a grooved girder 1 </ b> A as shown in FIGS. 9 to 12 and an engagement metal fitting 24 may be used. (A contact portion with respect to the engaging member 24 and a portion including the girder side surface 12 or the lower surface 13) and a contact portion including the protrusion 22 or the protrusion (a contact portion with respect to the girder and including the inner surface of the opposing vertical portion 23a. In the same manner as described above, the portion) may be appropriately grounded and then integrated by applying an adhesive, or may be integrated by filling a curable filler such as a non-shrink mortar between the contact portions. . A horizontal force or a lifting force can be transmitted between the grooved girder thus integrated and the engagement fitting 24. Even if the projection of the engagement fitting 24 is fitted in the groove 15 of the grooved girder 1A in the jacked-up state, the engagement fitting 24 is placed on the newly installed support device 21, and on that, The grooved girder 1A may be lowered to fit the groove and the protrusion, and the embodiment shown in FIGS. 1 to 5 may be implemented in the same manner.

  A grooved beam 1A having a combination of the form shown in FIGS. 6 to 8 and the form shown in FIGS. 9 to 12 or the engagement fitting 24 can be used. ) This will be described with reference to the representative form shown in (b).

13 (a) and 13 (b) show a representative form of the engagement fitting 24 having the side engagement member main body 23 and the protrusions 22i and 22j on the upper surface of the substrate 25. FIG. FIG. 13 (a) is a form in which a plurality of protrusions 22i are provided on the upper surface of the substrate 25, extending in the bridge axis direction and spaced in the direction perpendicular to the bridge axis, in the form shown in FIG. In such a form, a grooved girder 1A having a groove as shown in FIG. 9A on the lower surface of the existing concrete girder 1 and a groove as shown in FIG. That's fine.
In FIG. 13B, the side engaging member main body 23 is arranged symmetrically with the configuration shown in FIG. 6B, and is further extended on the upper surface of the substrate 25 in the direction perpendicular to the bridge axis and spaced in the bridge axis direction. In this embodiment, a plurality of protrusions 22j are provided in parallel.
In addition to the above, a grooved girder 1A is formed by combining a groove on the side surface of the girder as shown in FIG. 4 and a groove on the bottom surface of the girder as shown in any of FIGS. 6 to 8 may be used as the engagement fitting 24 in a combination form of the side engagement member main body 23 and the protrusion on the upper surface side of the substrate in any of the forms shown in FIGS. 9 to 12.

  In each of the above embodiments, when the groove 15 provided on the side surface of the girder 1 is in the vertical direction, the protrusion 22 fitted to the groove 15 is also in the vertical direction, and load transmission in the bridge axis direction is possible. Since the load 1 cannot be transmitted, the spar 1A and the engagement fitting 24 can be integrated by a curable filler such as an adhesive or a non-shrink mortar so that the upper lift force can be resisted, or a separate device (not shown) that resists the upper lift force. May be provided between the grooved beam 1A and the lower structure 4.

  Similarly, when the groove 15 provided on the lower surface of the girder 1 is in the bridge axis direction (the direction perpendicular to the bridge axis), the protrusion 22 fitted to the groove 15 is also in the bridge axis direction (the direction perpendicular to the bridge axis). Although load transmission in the direction perpendicular to the axis (bridge axis direction) is possible, load transmission in the bridge axis direction (direction perpendicular to the bridge axis) is not sufficient. The engagement metal fitting 24 is integrated to enable resistance in the bridge axis direction (the direction perpendicular to the bridge axis). Rather than a mode in which a shear force is applied to a curable filler such as an adhesive or a non-shrink mortar so as to transmit stress between the grooved beam 1A and the fitting 24, the adhesive or the non-shrink mortar is cured. A configuration in which a pressing force is applied to the conductive filler to transmit the stress between the grooved beam 1A and the engagement fitting 24 is preferable because a larger load can be transmitted.

  Next, from the state shown in FIG. 16 (a), the process from installation of the new support device to construction in the state shown in FIG. 17 (a) or FIG. 17 (b), or from the state shown in FIG. 16 (b). The process from installing the new support device to construction in the state shown in FIG. 18 (a) or FIG. 18 (b) will be described.

In the construction mode shown in FIG. 17 (a), as shown in FIG. 20, an engagement metal fitting 24 having a through hole 30 in which the sole plate 2 is arranged at the center portion of the substrate 25 is used. The sole plate 2 and the inner peripheral surface of the substrate 25 are integrated by welding, and the upper part of the new support device 21 and the substrate 25 are fixed by welding. FIG. 17B shows a form in which the upper mounting steel plate 28 of the new support device 21 is detachably fixed to the substrate 25 with bolts.
Although illustration is omitted, instead of the through hole 30 in FIG. 20, an engagement fitting 24 having a concave groove for disposing the sole plate 2 in the center of the substrate 25 is used, and the substrate 25 is attached to the sole plate 2. The sole plate 2 and the substrate 25 are integrated by bolts or the like, arranged on the lower side and fitted in the concave groove, and the upper portion of the new support device 21 and the substrate 25 are fixed by welding or bolts. Good. When the concave groove as described above is provided in the substrate 25, when the substrate 25 is fixed to the sole plate 2 by inserting a bolt from the lower surface side, a stepped through hole is provided in the substrate 25, and the sole plate 2 is provided. If the bolt head is accommodated in the stepped through-hole of the substrate 25 by providing a female screw hole in the bolt, the bottom surface of the substrate 25 and the upper surface of the newly installed support device 21 can be reliably touched in a large area. Or it can join by welding etc.

  In the case of further construction from the state of FIG. 16 (b), as shown in FIG. 18 (a), the upper part of the new bearing device 21 is fixed to the upper structure 1 by welding W as described above. It is a form. FIG. 18B shows a form in which the upper mounting steel plate 28 of the new bearing device 21 is fixed to the substrate 25 with bolts 28a from the state of FIG. 16B.

  Next, in the state shown in FIG. 19 (b), similarly to the embodiment shown in FIG. 16 (b), as shown in FIGS. 18 (a) and 18 (b), a new anchor bolt hole 17 is provided and a new support is provided. After the apparatus 21 is installed on the lower structure 4 side, the grooved girder 1A is installed on the board 25 so that the board 25 of the engagement fitting 24 is fixed to the upper part of the new support apparatus 21 by welding or bolts. Then, the engagement member main body 23 may be attached.

  As described above, in the renewal method of the existing bearing device of the present invention, the existing concrete is renewed by removing the existing bearing device 6 on the lower structure 4 and installing a new new bearing device 21. A groove 15 in a state that does not connect the internal reinforcing bar of the existing concrete beam 1 is provided on the side surface 12 or the lower surface 13 of the beam 1, and the protrusion 22 in the fitting 24 having the protrusion 22 that fits into the groove 15. Is provided on the existing concrete girder 1 so as to be engaged with the groove 15, and the existing concrete girder is supported on the new support device 21 via the engagement metal fitting 24.

  In the present invention, the reinforcing bar 14 in the existing concrete girder 1 is cut or not crushed (not removed), and a groove having a depth dimension within the cover thickness or a groove having a dimension deeper than the reinforcing bar diameter is formed. Since the groove is formed and formed into a groove, the existing concrete girder 1 does not need to be greatly processed, and the existing concrete girder 1 can be easily and inexpensively processed.

  When practicing the present invention, at least one set of inclined grooves adjacent to each other in the lateral direction is a groove in which one end side approaches each other and the other end side inclines in a direction away from each other. Correspondingly, the at least one pair of inclined protrusions adjacent in the lateral direction may be protrusions whose one end side approaches each other and the other end side inclines in a direction away from each other.

  As the cross-sectional shape of the groove, in addition to the illustrated recess, although not shown, a dovetail groove or a trapezoidal groove that expands outward may be used.

  When the present invention is carried out, the existing concrete girder may be applied to a plate girder or a box girder having a box section in addition to the I-shaped girder.

  In addition, when the upper structure and the lower structure are connected by the elastic buffering support device, it is possible to support the upper structure while buffering the horizontal movement and the lifting movement of the upper structure during an earthquake or the like.

  FIGS. 21 to 24 (a) and 25 show a representative form of another embodiment of the present invention. In this form, a groove is provided in the existing concrete girder 1 to form a grooved girder 1A. In addition, between the main bars 14a or between the stirrup bars 14b, the base end side longitudinal groove 15a having a groove depth corresponding to the concrete cover thickness, and the main bars 14a or the stirrup bars 14b are connected to the grooves 15a. A deep groove 15n having a depth approximately equal to the depth of the position, a proximal end protrusion 22n that fits into the proximal end longitudinal groove 15a and the deep groove 15n, and a distal end protrusion that has a larger protrusion dimension than the proximal protrusion. It is the form made into the engagement metal fitting 24 provided with 22m in the vertical part. Further, the engagement metal fitting 24 has a configuration in which plate-like protrusions and rod-like protrusions 22 are alternately provided in the bridge axis direction at intervals in the longitudinal direction of the side engagement member main body 23.

In this way, the deep groove 15n is provided to the inner side of the spar-wrap stirrup 14b or the main bar 14a in the width direction of the spar, and the stirrup bar 14b or the main bar 14a is in the projection plane in the bridge axis direction or the vertical direction. When the protrusion tip portion is located, the integration of the laterally or vertically grooved girder 1A and the engagement fitting 24 can be made more reliable than when the protrusion tip portion is positioned only in the cover concrete. . Further, as shown in FIG. 24 (a), the projection 22 may be fitted so as to simply contact the groove 15 on the grooved beam 1A side. However, as shown in FIG. It may be integrated with a curable adhesive such as a room temperature curable adhesive or a curable filler 34 such as a non-shrink mortar between the protrusions 22 and, as shown in FIG. The grooved beam 1A and the engagement fitting 24 are integrated by interposing a curable filler 34 such as an adhesive or a non-shrink mortar between the side surface 12 of the grooved beam 1A and the vertical portion of the engagement fitting 24. You may do it. Bonding strength increases in the order of (a), (b), and (c).
The relationship between the groove 15 of the grooved beam 1A and the protrusion 22 of the substrate 25 or the relationship between the outer surface of the beam and the substrate 25 can be applied in the same manner as in the above embodiment.

  In the form shown in FIG. 21, as the new support device 21, an elastic layer 36 is interposed between the new base plate 18 and the upper steel plate 35, and shear deformation restraint is performed so as to penetrate the elastic layer 36. The central support column 37 is fixed to the newly-installed base plate 18 by screw joint, and the central support column 37 is fitted and arranged through the micro gap between the upper steel plate 35 and the sole plate 2. 2 is integrated by a central column 37 and a nut 38 screwed into the upper end thereof, and the sole plate 2 is fixed to the base plate 25 in the engagement fitting 24 by welding (not shown) or bolt (not shown). In addition, the recess for accommodating the nut 38 or the through hole 33 is provided in the center of the substrate 25.

  In FIG. 21, the existing anchor bolt 5 is cut at an appropriate time in the recess 11, and the new anchor bolt 20 for fixing the new base plate 18 is a short new anchor bolt 20. It is connected by welding or the like to the upper transverse main reinforcement 14a which is embedded and fixed in the object 4.

  When the present invention is carried out, the protrusion 22 provided on the substrate 25 or the vertical portion of the side engaging member main body 23 is any form of a plate-like protrusion 22, a rod-like protrusion 22, or a block-like protrusion not shown. Or any combination of two or more of these may be used. Further, in the projection 22 arranged on the side surface side of the grooved beam 1A, when the plate thickness is thick or the outer diameter is large, the projection surface in the bridge axis direction or the vertical direction becomes large. By using the thick surface or the outer diameter surface, it is possible to transmit a load in the horizontal direction or the vertical direction between the grooved beam 1A and the engagement fitting 24 at the time of an earthquake.

In the embodiment described above, the form of the elastic bearing device is mainly shown as the new bearing device. However, when the present invention is implemented, the illustration is omitted, but a steel bearing device may be used. The concrete girder may be a T girder, a plate girder, a hollow girder, a box girder, or the like. Further, when the side surface of the concrete girder is an inclined vertical surface, the side engaging member main body 23 in the engaging metal member 24 may be inclined.
When carrying out the present invention, although not shown in the drawings, after covering concrete on the side surface or the bottom surface of the existing concrete girder, such as the bridge axial direction end, do not lift the rebar of that portion. A groove may be provided on the side surface or the lower surface of the existing concrete girder. In this case, with the projections fitted in the grooves, a filler such as non-shrink mortar or resin concrete is filled between the existing concrete girder and the engagement metal fitting to engage with the existing concrete girder. Engagement metal fittings may be provided so as to integrate the metal fittings, and the existing concrete girder may be supported by the new support device via the engagement metal fittings.

  In the above embodiment, the description has been mainly given of the form in which the protrusion is arranged in the slit-like or columnar groove in the concrete girder. However, when the present invention is implemented including the above-described embodiments, the bridge axis direction or the bridge axis is used. The entire projection group consisting of a plurality of projections may be fitted and disposed in a groove that is continuous in a perpendicular direction, and may be integrated with a curable filler such as an adhesive or non-shrink mortar. As representative forms, the different parts will be mainly described with reference to the forms shown in FIGS. 26 to 28 which are also modifications of the forms shown in FIGS.

  26 to 28 show a representative form of still another embodiment of the present invention. In this form, the vertical direction and the bridge axis direction are provided on both side surfaces of the existing concrete girder 1 in the direction perpendicular to the bridge axis. As a grooved girder 1A, a projection group 44 composed of a plurality or a plurality of projections 22 is fitted in the groove 15 of the grooved girder 1A in a loosely fitted state. It is the form which combined the engagement metal fitting 24 provided with the vertical part 23a.

  Thus, when the projection group 44 consisting of a plurality or a plurality of projections 22 is fitted into the continuous groove 15 and integrated with a curable filler 34 such as an adhesive or non-shrink mortar, the grooved beam 1A side is provided. At the site, the suspension process can be simplified, and the projection group 44 is loosely fitted in the groove 15 and is filled with a curable filler 34 such as an adhesive or a non-shrink mortar to engage with the grooved girder 1A. Since integration with the metal fitting 24 is only required, on-site construction can be easily performed in a short construction period. The relationship between the groove 15 on the lower surface side of the grooved beam 1A and the protrusion 22 of the substrate 25 or the relationship between the outer surface of the beam and the substrate 25 is a groove that is continuous in the direction perpendicular to the bridge axis and the direction of the bridge axis. The mode of fitting the groups in a loosely fitted state can also be applied as described above. Instead of the projection group 44, a block-like projection having a length, a width, and a projecting dimension over the projection group 44 is provided in the vertical portion 23a, and the block-like projection is fitted into the groove, and an adhesive is provided. Alternatively, a curable filler 34 such as a non-shrink mortar may be filled so that the grooved beam 1A and the engagement fitting 24 are integrated.

  In this embodiment, it is sufficient that at least the groove 15 and the projection group 44 of the grooved beam 1A and the engagement fitting 24 are fixed by a curable filler 34 such as an adhesive or a non-shrink mortar, You may make it adhere to the vertical part 23a in the engagement metal fitting 24 to the grooved girder 1A.

  In the case of carrying out the present invention, in order to enhance the integration of the protrusions 22 (22a to 22m) in the engagement metal fitting 24 and the existing concrete girder via an adhesive or a curable filler such as a non-shrink mortar, The protrusion 22 (22a to 22m) may be provided with a concave portion or a through hole to prevent displacement. When a through hole is provided in the protrusion 22 (22a to 22m), a rebar is inserted and arranged in one through hole to enhance the displacement prevention effect, or across the through holes of the plurality of protrusions 22 (22a to 22m). The reinforcing effect may be improved by inserting and arranging the reinforcing bars. In this case, the groove provided with the reinforcing bar storage part is expected in view of the position of the reinforcing bars inserted and arranged in the through holes of the protrusions 22 (22a to 22m). It is good to provide. However, in the embodiment shown in FIGS. 26 to 28, the groove provided in the existing concrete girder 1 is the groove 15 that is continuous in the bridge axis direction, the bridge axis perpendicular direction, or the vertical direction. Thus, a reinforcing bar storage portion corresponding to each protrusion is provided. The same applies to the case where the block-shaped protrusion is provided with a recess or a through hole to prevent displacement.

  When practicing the present invention, the outer surface of the engagement fitting 24 may be galvanized or covered with rubber to enhance the rust prevention effect. In the field, when the side fitting member main body 23 is fixed to the substrate 25 by welding to constitute the engagement fitting 24, galvanization or rubber coating is applied except for the portion to be welded. Further, after welding the side engaging member body 23 to the substrate 25 or fixing the bolts, the portion not covered with the anticorrosive coating is applied by brushing or spraying, etc. Rust may be achieved, or cover rubber may be put on the fitting 24 to prevent rust.

It is a vertical front view which shows the state which implemented the present invention and updated the existing elastic bearing apparatus. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a side view which shows the pattern of the groove | channel provided in the side surface of the existing concrete girder. It is a perspective view which takes out and shows the engagement metal fitting provided in the existing concrete girder. (A) (c) is a side view which shows the state which provided the engagement metal fitting in the girder, (b) (d) is a perspective view which shows the side part structural member provided with the protrusion by the side of an engagement metal fitting. (E) (g) (i) is a side view showing a state in which an engagement fitting is provided on a girder, and (f), (h), and (j) are perspective views showing a side component member provided with a projection on the engagement fitting side. FIG. (K) (m) is a side view which shows the state which provided the engagement metal fitting in the girder, (l) (n) is a perspective view which shows the side part structural member provided with the protrusion by the side of an engagement metal fitting. (A) (c) is a bottom view which shows the pattern of the groove | channel provided in the bottom face of the existing concrete girder, (b) (c) shows the engagement metal fitting provided with the protrusion corresponding to (a) (c), respectively. It is a perspective view. (E) is a bottom view which shows the pattern of the groove | channel provided in the bottom face of the existing concrete girder, (f) is a perspective view which shows the engagement metal fitting provided with the protrusion corresponding to (a) and (c), respectively. (G) (i) is a bottom view showing a groove pattern provided on the bottom surface of an existing concrete girder, and (h) and (j) show engagement fittings each having a protrusion corresponding to (g) and (i). It is a perspective view. (K) (m) is a bottom view showing a groove pattern provided on the bottom surface of an existing concrete girder, and (l) and (n) show engagement fittings each having a projection corresponding to (k) and (m). It is a perspective view. (A) (b) is a perspective view which shows the other form of an engagement metal fitting. (A) and (b) are perspective views showing other forms of an engagement metal fitting. It is a vertical front view which shows one form of the existing support apparatus. (A) is a longitudinal front view showing a state in which the existing support device is removed while leaving the sole plate from the state of FIG. 15, and (b) is a longitudinal front view showing a state in which the existing support device is removed including the sole plate. It is. (A) is a vertical front view which shows the state which installed the engagement metal fitting and the newly installed support apparatus from the state of Fig.16 (a). FIG. 17B is a longitudinal front view showing a state in which the engagement fitting and the new support device are installed from the state of FIG. (A) is a longitudinal cross-sectional front view which shows the state which installed the engagement metal fitting and the newly installed support apparatus from the state of FIG.16 (b). FIG. 17B is a longitudinal front view showing a state in which the engagement fitting and the new support device are installed from the state of FIG. (A) is the longitudinal front view which shows the other form of the existing support apparatus, (b) is a longitudinal front view which shows the state which removed the existing support apparatus. It is a perspective view which shows the form of the engagement metal fitting used in Fig.17 (a) (b). It is a longitudinal front view which shows other embodiment of this invention, Comprising: The state which implemented the present invention and updated the existing support apparatus. It is CC sectional view taken on the line of FIG. FIG. 22 is a cross-sectional plan view of the vicinity of one engagement fitting and a grooved girder in FIG. 21. (A) (b) (c) is a partial cross-sectional top view which shows the relationship between the groove | channel provided in the beam side, and the protrusion fitted to this, and the engagement relationship of a beam and an engagement metal fitting. It is a perspective view which takes out and shows the engagement metal fitting shown in FIG. It is a longitudinal front view which shows other embodiment of this invention, Comprising: The state which implemented this invention and updated the existing support apparatus. It is the DD sectional view taken on the line of FIG. FIG. 27 is a cross-sectional plan view of the vicinity of one engagement fitting and a grooved girder in FIG. 26.

Explanation of symbols

1 Existing concrete girder 1A Grooved girder 2 Sole plate 3 Anchor bolt (existing concrete girder side)
4 Lower structure 5 Anchor bolt (lower structure side)
6 Existing bearing device 7 Upper lifting stopper 8 Lower base plate 9 Vertical part (lower base plate side)
DESCRIPTION OF SYMBOLS 10 Elastic support body 11 Recessed part 12 Side surface 13 Lower surface 14 Reinforcing bar 14a Main reinforcing bar 14b Stirrup bar 15 Groove 15a Vertical groove, base end side vertical groove 15b Horizontal groove 15c First vertical inclined groove 15d Second vertical inclined groove 15e Circular groove 15f Vertical long groove ( Girder bottom)
15 g Horizontally long groove 15 h Vertically inclined groove 15 k Horizontally inclined groove 15 n Deep groove 16 Vertical rib 17 New anchor bolt hole 18 New base plate 19 Non-shrink mortar 20 New anchor bolt 21 New bearing device 22 Protrusion 22 a Protrusion 22 b Protrusion 22 c First inclined protrusion 22 d Second inclined projection 22f Circular projection 22i Projection 22j Projection 22k Projection 22n Base end projection 22m Tip side projection 23 Side engagement member main body 24 Engagement bracket 25 Substrate 26 Reinforcing vertical rib 27 Restraint wall 28 Upper mounting steel plate 29 Lower Mounting steel plate 30 Through hole 31 Head flange 32 Bolt 33 Through hole 34 Hardening filler 35 such as adhesive or non-shrink mortar Upper steel plate 36 Elastic layer 37 Central column 40 Elastic body 41 Lower support member 42 Shear restraining wall 43 bolt

Claims (8)

  In the renewal method of the existing bearing device that removes the existing bearing device on the substructure and installs a new bearing device, the internal rebar of the existing concrete girder is not connected to the side or lower surface of the existing concrete girder The engaging metal fitting is provided in an existing concrete girder so that the protrusion in the engaging metal fitting provided with the protrusion fitting in the groove is fitted in the groove, A method for renewing an existing bearing device, in which an existing concrete girder is supported by a new bearing device.   In the renewal method of the existing bearing device that removes the existing bearing device on the substructure and installs a new bearing device, the internal rebar of the existing concrete girder is not connected to the side or lower surface of the existing concrete girder Providing the groove in the engaging metal fitting provided with a plurality of protrusions fitted into the groove, the fitting metal fitting is provided in the existing concrete girder so as to fit in the groove, The existing concrete girder and the engagement metal fitting are at least the groove and the projection group fixed by a curable filler such as an adhesive or non-shrink mortar, and the existing concrete girder is newly installed via the engagement metal fitting. Renewal method of existing bearing device, characterized in that it is supported by the device.   2. The existing bearing device according to claim 1, wherein at least the groove and the protrusion of the existing concrete girder and the fitting are fixed by a curable filler such as an adhesive or a non-shrink mortar. Renewal construction method.   The said groove | channel is a groove | channel inclined in a horizontal direction or an up-down direction, Corresponding to this, the said protrusion is a protrusion inclined in a horizontal direction or an up-down direction, The Claim 1 or 3 characterized by the above-mentioned. Renewal method for existing bearing devices.   The groove is a groove having a thickness range of the cover concrete or a depth having a depth exceeding the thickness of the cover concrete. Correspondingly, the protrusion has a thickness range of the cover concrete or a thickness of the cover concrete. The renewal method for an existing bearing device according to any one of claims 1 to 4, wherein the protrusion has a protrusion length exceeding the protrusion length.   In the renewal method of the existing bearing device that removes the existing bearing device on the substructure and installs a new bearing device, the internal rebar of the existing concrete girder is not connected to the side or lower surface of the existing concrete girder An engaging metal fitting is provided on an existing concrete girder so that the protrusion in the engaging metal fitting provided with a protrusion fitted in the groove is fitted in the groove, and the existing metal fitting is provided via the engaging metal fitting. An update structure of an existing bearing device, wherein a concrete girder is supported by a new bearing device.   In the renewal method of the existing bearing device that removes the existing bearing device on the substructure and installs a new bearing device, the internal rebar of the existing concrete girder is not connected to the side or lower surface of the existing concrete girder The engaging metal fitting is provided on the existing concrete girder so that the protrusion group in the engaging metal fitting provided with a plurality of protrusions fitted into the groove is fitted in the groove. The concrete girder and the engagement metal fitting are such that at least the groove and the projection group are fixed by a curable filler such as an adhesive or a non-shrink mortar, and the existing concrete girder is newly installed via the engagement metal fitting. A structure for updating an existing bearing device, which is supported by   The existing bearing device according to claim 6, wherein at least the groove and the protrusion of the existing concrete girder and the engagement fitting are fixed by a curable filler such as an adhesive or a non-shrink mortar. Update structure.

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