JP5683326B2 - Displacement limiting device installation method, displacement limiting device, and bridge girder displacement limiting structure - Google Patents

Description

The present invention relates to an installation method of a displacement limiting device that prevents a bridge girder from being greatly displaced due to an earthquake and the like and suppresses falling from an abutment or a pier, and a displacement limiting device and a displacement limiting structure in which the displacement limiting device is installed. Specifically, the present invention relates to a displacement limiting device in which a concave member, which is one of the constituent members, is composed of two or more divided bodies, an installation method thereof, and a displacement limiting structure of a bridge girder in which the displacement limiting device is installed.

  It has been regarded as a problem for some time that the bridge girder has fallen from the structure that supports the bridge girder such as the abutment and the pier (hereinafter referred to as “supporting frame”). More than ever before, the countermeasures against this fallen bridge have attracted attention. The term “falling bridge” is widely used for various damage phenomena in bridges. In this document, for the sake of convenience, the term “falling bridge” means that a bridge girder falls from a support frame.

The falling bridge is mainly caused by a large displacement of the bridge girder. One of the most representative measures against bridge girder displacement is support (沓). This support includes the function to transmit the vertical load transmitted from the superstructure including the bridge girder to the substructure such as the abutment, the expansion and contraction of the superstructure accompanying the temperature change, and the horizontal displacement accompanying the impact load and braking load by the vehicle. A function to follow is required. By the function of following the horizontal displacement (hereinafter simply referred to as “following function”), stress concentration at the fulcrum of the bridge girder can be prevented and a predetermined displacement can be absorbed.

  The bearings are classified into rubber bearings, steel bearings, etc. according to the constituent materials, classified into fixed bearings and movable bearings according to the purpose, and further classified into type A and type B according to the corresponding earthquake level. Type A bearings are capable of following a level 1 earthquake (a relatively small earthquake that is expected to occur once or twice in service), but a level 2 earthquake (such as the Hyogoken Nanbu Earthquake) Large-scale earthquakes with a very low probability of occurrence) and complement the displacement limiter to exhibit a tracking function. On the other hand, the Type B support exhibits a tracking function independently up to Level 2 earthquakes as well as Level 1 earthquakes.

  In this way, when installing a type A support, a displacement limiting device is often installed together, and also when installing a type B support, the displacement limiting device follows the horizontal displacement in the direction perpendicular to the bridge axis. May be installed.

  The mechanism of the conventional displacement limiting device will be described as follows. The component is a protrusion-like stopper and a pot portion with which the stopper is engaged. In many cases, the stopper is installed on a support housing and the pot portion is installed on a bridge girder. The stopper is engaged with the accommodating space in the pot portion, that is, the stopper can move only in a limited space in the accommodating space, so that the displacement of the stopper is limited, and as a result, the bridge girder and the support housing are moved. The relative displacement can be limited.

  The displacement limiting device has been widely used especially after the Hyogoken-Nanbu Earthquake, and various devices have been devised so far. For example, Patent Document 1 proposes a device capable of limiting not only horizontal displacement but also vertical displacement. Yes. Also, “dividing the pot portion” focused on in the present invention is shown in Patent Document 1 and Patent Document 2, although the problems to be solved and actions / effects are different.

JP 2008-25243 A JP 2005-139705 A

  The falling bridge prevention structure shown in Patent Document 1 is composed of a first member (pot portion) installed in the upper work and a second member (stopper) installed in the lower work, and the convex portion provided in the second member. Is provided with an extended head. This extended head is intended to resist the vertical displacement of the superstructure by being locked to the lower edge of the first member.

  On the other hand, the invention shown in Patent Document 2 relates to a support for a floating bridge connected to a floating island or the like, and relates to a support that can be guided freely in a vertical direction and a horizontal direction.

  Although Patent Document 1 is a displacement limiting device and Patent Document 2 is a support, each of the subject technologies is different, both of which are largely composed of two members and one member is divided. Patent Document 1 shows that the first member is divided into a front structure and a rear structure, and Patent Document 2 shows that the bearing body is divided into two halves. . And the piece divided | segmented also in any patent document shall be used by connecting and integrating with a volt | bolt etc. That is, in Patent Document 1, it is described that a front structure and a rear structure are combined and fixed with a bolt, and in Patent Document 2, two halves are abutted and integrated with a bolt at a collar. It is described that.

  The conventional displacement limiting devices including Patent Document 1 have the following problems. In other words, the displacement limiter is often installed after the completion of the superstructure and substructure, and in order to install a displacement limiter with a relatively large size and weight in a limited construction space between the superstructure and substructure, The problem was that the installation work was difficult and the safety of the workers was inferior. In particular, as in Patent Document 1, when an extended head is provided on the stopper (second member), it is necessary to install the expanded head after the pot portion (first member) is accommodated in advance. Therefore, the difficulty in construction further increases, and the safety in terms of work safety decreases.

  Although Patent Document 1 and Patent Document 2 show that the pot portion (first member, bearing body) is divided into two parts, these are connected and integrated, so that eventually the displacement It is not possible to reduce the size and weight of the limiting device, that is, the above-described problems related to construction difficulty and work safety are not improved.

  An object of the present invention is to solve the problems of the prior art, and to provide an installation method of a displacement limiting device, a displacement limiting structure, and a displacement limiting device that are extremely excellent in workability and can ensure safety in work. It is to provide.

  The invention of the present application was developed by focusing on the fact that in a displacement limiting device composed of a convex member and a concave member, the divided concave members are separated and connected to each other without being connected. This is a departure from the fixed idea that the members are used in an integrated manner.

The displacement limiting device according to the present invention is installed in a support space between a support frame such as an abutment or a pier and a bridge girder supported by a support on the support frame, and the horizontal direction between the bridge girder and the support frame is set. In the method of installing a displacement limiting device capable of limiting relative displacement or relative displacement in the horizontal and vertical directions , the displacement limiting device includes a convex member and a concave member, the convex member includes a stopper, and the concave member. Comprises two or more divided bodies, each divided body having a housing wall capable of enclosing a part of the outer periphery of the stopper and a housing recessed portion inside thereof, and the convex member is fixed to either the bridge girder or the support housing. The concave member surrounds the outer periphery of the convex member and is fixed to the other of the bridge girder and the support case, and the relative displacement of the bridge girder and the support case can be limited by the convex member and the concave member, Support space A convex member installation step of arranging the convex member of the displacement limiting device from the side and fixing the convex member to one of the bridge girder and the support housing, and after fixing the convex member by the convex member installation step, From the side, in the support space, outside the stopper of the convex member, two or more divided bodies of the concave material are individually arranged and fixed to either the bridge girder or the support frame, and this arrangement fixing is performed. The step of enclosing the outside of the stopper of the convex member with the housing wall of the two or more divided bodies and providing a gap between the outer peripheral surface of the stopper and the inner circumferential surface of the recessed portion of the divided body by performing as many as the number of the divided bodies It is a method provided with .

The displacement limiting device according to the present invention is installed in a support space between a support frame such as an abutment or a pier and a bridge girder supported by a support on the support frame, and the horizontal direction between the bridge girder and the support frame is set. In the method of installing a displacement limiting device capable of limiting relative displacement or relative displacement in the horizontal and vertical directions , the displacement limiting device includes a convex member and a concave member, the convex member includes a stopper, and the concave member. Comprises two or more divided bodies, each divided body having a housing wall capable of enclosing a part of the outer periphery of the stopper and a housing recessed portion inside thereof, and the convex member is fixed to either the bridge girder or the support housing. The concave member surrounds the outer periphery of the convex member and is fixed to the other of the bridge girder and the support case, and the relative displacement of the bridge girder and the support case can be limited by the convex member and the concave member, Support space side A partial body installation step in which a part of the displacement limiting device is disposed in the support space and fixed to either the bridge girder or the support frame, and the division body is installed and fixed by the split body installation step. From the side of the support space, a convex member installation step of disposing the convex member of the displacement limiting device inside the support recess and inside the accommodating recess of the divided body and fixing it to either the bridge girder or the support housing And after installing and fixing a part of the divided body by the divided body installation step, after installing and fixing the convex member by the convex member installation step, in the support space from the side of the support space, By arranging another divided body on the outside of the stopper of the convex member and fixing it to the bridge girder or the support frame to which the divided body is fixed first, the divided body and the divided body that has been installed and fixed earlier are used to fix the stopper. Enclose the outer periphery It may be a method comprising the step of providing a gap between the outer peripheral surface and the housing recess inner peripheral surface of the divided body of the stopper.

The displacement limiting device of the present invention is installed in a support space between a support frame such as an abutment or a pier and a bridge girder supported by a support on the support frame, and a horizontal relative displacement between the bridge girder and the support frame or In the displacement limiting device capable of limiting the relative displacement in the horizontal and vertical directions , the displacement limiting device includes a convex member and a concave member, and the convex member protrudes vertically from the fixed plate and the fixed plate. A stopper is provided, and the concave member has two or more divided bodies, each of the divided bodies has a housing wall capable of enclosing a part of the outer periphery of the stopper and an inner housing concave portion, and the convex member is located on the side of the support space. It can be arranged in the support space from the side, and can be fixed to either the bridge girder or the support frame, and the divided body of the recess material can be individually arranged in the support space from the side and bridge girder and the support frame. And either The outer periphery of the stopper can be surrounded by two or more divided bodies, and the receiving recesses of the two or more divided bodies can enclose the outer peripheral surface of the stopper and the divided body by surrounding the outer periphery of the stopper. The recess material in which a gap is formed between the wall and the inner peripheral surface, and the two or more divided bodies are arranged and fixed, and the stopper surrounded by the recess material are horizontal or horizontal between the bridge girder and the support frame. It is possible to limit the relative displacement by collision when the relative displacement occurs in the direction and the vertical direction .

In the displacement limiting device of the present invention, in the displacement limiting device, the stopper of the convex member is a prismatic shape, the inner surface of the housing recess of the divided body is flat, and the inner surface of the housing recess is a stopper when a relative displacement in the horizontal direction occurs. It is also possible to make a surface collision with the outer peripheral surface of the.

In the displacement limiting device according to the present invention, in the displacement limiting device, a stopper extension portion is provided on the tip end side of the stopper so as to extend horizontally outside the outer peripheral surface of the stopper, and two or more divided bodies are arranged and fixed in the support space. By doing so, it is possible to surround the stopper and the lower part of the stopper extension .

The displacement limiting device according to the present invention is the above displacement limiting device , wherein the divided body includes an obstruction plate, and the obstruction plate can collide with the outer circumferential surface of the stopper when the relative displacement in the horizontal direction is generated, from the accommodating wall of the divided body. It can also project horizontally inside.
A displacement limiting device characterized by that.

In the displacement limiting device of the present invention, in the displacement limiting device, an elastic buffer material may be provided on either the outer periphery of the stopper or the tip of the obstacle plate.

The displacement limiting structure of the present invention is a horizontal or horizontal and vertical direction between a bridge girder and a support frame in a support space between a support frame such as an abutment or a pier and a bridge girder supported by a support. A displacement limiting structure in which a displacement limiting device capable of limiting the relative displacement is installed, wherein the displacement limiting device is the displacement limiting device according to claim 3, and the convex member of the displacement limiting device is a support between the bridge girder and the support frame. Installed in the space, fixed to either the bridge girder or the support frame, the stopper of the convex member protrudes into the support space, and two or more divided bodies are installed in the support space, and either the bridge girder or the support frame The outer periphery of the stopper is surrounded by the housing wall of the divided body, and a gap is formed between the outer peripheral surface of the stopper and the inner surface of the housing recess of the divided body. When displacement occurs A structure in which the relative displacement is limited the two or more divided body and a stopper enclosed by them collide.

The displacement restriction structure of the bridge girder of the present invention has a horizontal or horizontal direction between the bridge girder and the support frame in a support space between the support frame such as the abutment and the pier and the bridge girder supported by the support. In a bridge girder displacement limiting structure provided with a displacement limiting device capable of limiting the relative displacement in the vertical direction, the displacement limiting device is a displacement limiting device in which the stopper is a prismatic shape, and the displacement limiting device A convex member is disposed in a support space between the bridge girder and the support housing, fixed to either the bridge girder or the support housing, and a prismatic stopper of the convex member protrudes into the support space, and two or more divided bodies Is disposed in the support space, fixed to either the bridge girder or the support frame, and the outer periphery of the prismatic stopper is surrounded by the partition wall, and the outer peripheral surface of the prismatic stopper and the split body The inner surface of the receiving recess A structure is formed in which a gap is formed between them, and when the relative displacement between the bridge girder and the support frame occurs, the two or more divided bodies and the prismatic stopper surrounded by them collide with each other, and the relative displacement is limited. There is .

The displacement restriction structure of the bridge girder of the present invention has a horizontal or horizontal direction between the bridge girder and the support frame in a support space between the support frame such as the abutment and the pier and the bridge girder supported by the support. 6. A bridge girder displacement restriction structure in which a displacement restriction device capable of restricting relative displacement in the vertical direction is installed, wherein the displacement restriction device is a displacement restriction device provided with a stopper extension, and the convex member. Is disposed in a support space between the bridge girder and the support frame, fixed to either the bridge girder or the support frame, the stopper of the convex member projects into the support space, and two or more divided bodies are disposed in the support space. The bridge girder and the support frame are fixed to the other, the outer periphery of the stopper, and the lower part of the stopper extension is surrounded by two or more divided body housing walls, between the stopper and the inner surface of the housing housing recess. Gaps formed The a 2 or more divided member and the stopper and the stopper extension is a structure in which the relative displacement occurs during a collision to their relative displacement between the bridge girder and the support skeleton is limited.

The displacement restriction structure of the bridge girder of the present invention has a horizontal or horizontal direction between the bridge girder and the support frame in a support space between the support frame such as the abutment and the pier and the bridge girder supported by the support. A bridge girder displacement restriction structure provided with a displacement restriction device capable of restricting relative displacement in the vertical direction, wherein the displacement restriction device is a displacement restriction device in which the divided body includes an obstacle plate, and a convex member Is installed in a support space between the bridge girder and the support frame, fixed to one of the bridge girder and the support frame, a stopper of the convex member protrudes into the support space, and two or more divided bodies support the support It is installed in a space and is fixed to either the bridge girder or the support frame, and the outer periphery of the stopper is surrounded by two or more divided body housing walls and obstacle plates, and the stopper, the divided body, the housing wall, and the obstacle A gap is formed between the plate The is a 2 or more failures plate and stopper divided bodies, a structure in which the collided during a relative displacement occurs the relative displacement between the bridge deck and the support skeleton is limited.

The displacement restriction structure of the bridge girder of the present invention is the horizontal space between the bridge girder and the support frame in the support space between the support frame such as the abutment or the pier and the bridge girder supported and installed on the support frame. In the displacement limiting structure of the bridge girder in which the displacement limiting device capable of limiting the relative displacement in the horizontal direction and the vertical direction is installed, the displacement limiting device is any one of the divided body and the stopper according to claim 7, The convex member is installed in the support space between the bridge girder and the support housing, and is fixed to either the bridge girder or the support housing, and the stopper of the convex member protrudes into the support space. And the two or more divided bodies are installed in the support space and fixed to either the bridge girder or the support housing, and the stopper is surrounded by the housing wall of the two or more divided bodies. Between the housing recess and the inner surface A gap is formed, and the buffer material of the stopper and the inner surface of the housing recess of the two or more divided bodies, or the buffer material of two or more divided bodies and the outer peripheral surface of the stopper collide when the relative displacement occurs. The relative displacement is limited .

The displacement limiting device installation method, bridge girder displacement limiting structure, and displacement limiting device of the present invention have the following effects.
(1) The movement of the convex member is restricted when the stopper engaged in the concave member collides with the housing wall, and thus the relative displacement between the bridge beam and the support housing can be surely restricted. Furthermore, if the concave member is provided with an obstacle plate and the convex member is provided with a stopper extension, the relative displacement in the vertical direction can be limited.
(2) Since the recess material is divided into two or more divided bodies, small transportation and installation work are facilitated, and as a result, work safety is improved.
(3) Especially when the obstacle plate and the stopper extension part are provided to limit the displacement in the vertical direction, proceed with the procedure of partially installing the divided body, installing the convex member, and installing the remaining divided body. Therefore, it is not necessary to integrate the convex member and the concave member in advance, and the workability and work safety are remarkably excellent as compared with the conventional case.
(4) Since the installed concave member can be removed for each divided body, that is, the concave member or the convex member can be easily removed, the replacement is facilitated and the maintenance is excellent.

The whole figure which looked at the bridge where the displacement limiting device of the present invention was installed from the side. (A) is a side view which shows the detail of the attachment location of a displacement limiting apparatus, (b) is the AA arrow sectional drawing of (a), (c) is BB arrow sectional drawing of (a). The perspective view explaining a convex member. (A) is sectional drawing which shows the shock absorbing material attached to the trunk | drum outer peripheral surface of a stopper, (b) is sectional drawing which shows the shock absorbing material attached to the trunk | drum outer peripheral surface and upper surface of a stopper, (c) is a stopper of FIG. Sectional drawing which shows the shock absorbing material attached to the trunk | drum outer peripheral surface and the lower surface of a stopper expansion part, (d) is sectional drawing which shows the shock absorbing material attached to the recessed part material. (A) is a perspective view which shows the recessed material in the state before a convex member is engaged, (b) is a perspective view which shows the recessed material in a state after the convex member is engaged. (A) is the top view which looked at the installation state of a displacement limiting device from the upper side, (b) is XX arrow sectional drawing of (a), (c) is YY arrow sectional drawing of (a). . The top view which looked at the installation state of the displacement control apparatus which a recessed part material consists of four division bodies from the downward side. (A) is a model diagram for explaining the action of the displacement limiting device when relative horizontal displacement occurs between the abutment and the bridge girder, and (b) shows the operation of the displacement limiting device when relative vertical displacement occurs between the abutment and the bridge girder. The model figure explaining about. (A) is sectional drawing explaining the 1st recessed part installation process which installs some division bodies among recessed parts, (b) is sectional drawing explaining the convex part installation process which installs a convex member in an abutment, ( c) Sectional drawing explaining the 2nd recessed part installation process which attaches the remaining division body 7 and completes installation of the recessed part material 6. FIG.

[Embodiment]
An embodiment of a displacement limiting device installation method, a bridge girder displacement limiting structure, and a displacement limiting device according to the present invention will be described with reference to the drawings.

(overall structure)
First, the overall configuration of the present invention will be briefly described. 1 is an overall view of a bridge on which a displacement limiting device 1 (FIG. 2 (a)) of the present invention is installed as seen from the side, and FIG. 2 is a detailed view of a portion D shown in FIG. ) Is a side view showing details of the location where the displacement limiting device is attached, FIG. 2B is a cross-sectional view taken along the line AA of FIG. 2A, and FIG. 2C is BB of FIG. It is arrow sectional drawing.

  The bridge shown in FIG. 1 is a simple bridge type bridge bridge, and an abutment 2 constructed on each of the left bank and the right bank supports the bridge girder 3 via a support 4. One of the bearings 4 (left side in the figure) is a fixed bearing 4a (fix), and the other (right side in the figure) is a movable bearing 4b (move).

  The displacement limiting device 1 is installed between the top and bottom of the abutment 2 (left side in FIG. 1) and the bridge girder 3 on the side of the fixed support 4a. For example, as shown in FIG. Can be installed side by side. In this figure, the displacement limiting device 1 is installed on the bracket Br fixed to the abutment 2 by bolts. However, it is of course possible to install it directly on the abutment 2 without providing the bracket Br. Further, the displacement limiting device 1 and the support 4 are not limited to be installed side by side in the bridge axis direction, but can be installed at any position around the support 4 (for example, side by side in the direction perpendicular to the support 4 and the bridge axis).

  Here, as shown in FIG. 1, the case where the displacement limiting device 1 is installed between the abutment 2 and the bridge girder 3 on the fixed support 4a side is described, but the installation place of the displacement limiting device 1 is limited to this. Is not to be done. For example, the displacement limiting device 1 can be installed between the abutment 2 (right side in FIG. 1) and the bridge girder 3 on the movable support 4b side, or can be installed between the pier and the bridge girder 3 instead of the abutment 2. . In other words, the displacement limiting device 1 can be installed at any location between the superstructure (such as the bridge girder 3) and the substructure (supporting frame such as the abutment 2 and the pier). Of course, not only the simple bridge type bridge bridge, but also any structural type (multi-span type etc.) and girder format (plate girder, box girder, cast-in-place concrete girder, steel girder, PC girder, etc.) The displacement limiting device 1 of the present invention can be installed on various bridges such as bridges for various purposes such as bridges, viaducts, overpasses, and overpasses, new bridges, and existing bridges.

  The displacement limiting device 1 of the present invention is mainly composed of two members, one is a convex member 5 and the other is a concave member 6 (FIG. 2 (c)). The convex member 5 is fixed to the abutment 2, and one concave member 6 is fixed to the bridge girder 3. The convex member 5 is engaged in the accommodation space (detailed later) of the concave member 6 and can move freely within this accommodation space. In other words, the range of movement of the convex member 5 is limited to the space in which the concave member 6 is accommodated. As a result, the relative horizontal displacement between the abutment 2 and the bridge girder 3 fixing the convex member 5 is reduced. Limited. Here, the relative horizontal displacement (hereinafter referred to as “relative horizontal displacement”) means the displacement of the other (for example, bridge girder 3) viewed from one (for example, abutment 2). When the abutment 2 and the bridge girder 3 are simultaneously moved in the same direction by the same amount, no relative displacement occurs. In addition, the relative horizontal displacement described here means a displacement in the horizontal direction (not only in a strict horizontal direction but also in a substantially horizontal direction), but in any direction within the horizontal plane (bridge axis direction, bridge axis) Displacement in a perpendicular direction, etc.).

  As described above, the displacement limiting device 1 is a combination of the convex member 5 and the concave member 6, and either the convex member 5 or the concave member 6 is installed on the abutment 2 and the other is installed on the bridge girder 3. To do. As shown in FIG. 2A, not only when the convex member 5 is installed on the abutment 2 and the concave member 6 is installed on the bridge girder 3, but the concave member 6 is installed on the abutment 2 and the convex member 5 on the bridge girder 3. May be installed. However, since the recessed member 6 has a shape in which water is likely to accumulate, when the recessed member 6 is installed on the lower work side such as the abutment 2, it is desirable to provide a drainage means such as a drain hole.

  The recessed member 6 constituting the displacement limiting device 1 of the present invention is composed of a plurality of divided bodies 7 as shown in FIG. In general, the displacement limiting device 1 is often installed on an existing bridge. In this case, a large and heavy member is handled in a narrow space between the abutment 2 and the bridge girder 3, and the operator is always injured. With danger. By dividing the recess material 6, it is possible to expect the effect that the member to be handled becomes light and small, and the safety and workability in work are improved. The number of divisions of the concave member 6, that is, the number of the divided bodies 7 constituting one concave member 6 can be any number as long as it is two or more. It is desirable to design with an appropriate number of divisions in consideration. Here, for the sake of convenience, the case where the concave member 6 is divided into two parts will be described.

  Hereinafter, each component will be described in detail.

(Convex member)
FIG. 3 is a perspective view for explaining the convex member 5. In addition, in this figure, the state which decomposed | disassembled the convex member 5 for every main components is shown on account. The convex member 5 is fixed to the bridge girder 3 directly or indirectly (via the bracket Br), and the convex member 5 and the abutment 2 behave together. That is, if the displacement of the convex member 5 can be limited, the displacement of the bridge girder 3 can also be limited.

  As shown in FIG. 3, the convex member 5 includes a fixed plate 51 and a stopper 52. The fixing plate 51 is a steel plate, and is provided with a predetermined number (four in the figure) of bolt holes 51a for bolting to the abutment 2. The stopper 52 is a rectangular parallelepiped having a bottom area smaller than that of the fixed plate 51 and is also made of steel. The bottom surface portion of the stopper 52 is welded to the fixed plate 51 to form the convex member 5.

  The convex member 5 used in the present invention is a member in which only the stopper 52 which is a protrusion standing on the fixed plate 51 is essential. The shape of the stopper 52 is not limited to the rectangular parallelepiped in FIG. 3 as long as it is a protrusion that is erected when installed on the abutment 2, and can be a cylinder, an elliptical column, a polygon, or any other shape. Further, if the displacement of the bridge girder 3 can be limited, the bridge girder 3 can be fixed to the fixed plate 51 by a conventional method other than welding, or can be directly fixed to the abutment 2 without using the fixed plate 51. Further, the material of the stopper 52 is not limited to steel, and various materials can be used as long as the design requirements for strength are satisfied.

  The stopper 52 can be provided with a stopper extension 53. As will be described later, by providing the stopper extension 53, the relative vertical displacement of the abutment 2 and the bridge girder 3 (hereinafter referred to as “relative vertical displacement”) can be limited. The stopper extension 53 projects perpendicularly to the axial direction of the stopper 52 (the vertical direction in FIG. 3). If the convex member 5 is installed on the abutment 2, the vertical direction (substantially vertical direction) will be described. The stopper extension 53 extends in a horizontal direction (including a substantially horizontal direction) with respect to the stopper 52 standing upright. In FIG. 3, a stopper extension 53 made of a steel plate having a larger area than the section of the stopper 52 is welded and fixed to the top (upper surface) of the stopper 52. The fixing method here is not limited to the welding means, and various methods such as bolt fixing can be used. The material of the stopper extension 53 is not limited to steel but can be various as long as it satisfies the design requirements for strength. Can be adopted. Furthermore, in addition to fixing the stopper extension 53 as a separate body from the stopper 52, the stopper extension 53 can be provided by expanding a part of the stopper 52 at the manufacturing stage.

  In the convex member 5 installed on the abutment 2, the stopper 52 is engaged with the concave member 6, and when a relative horizontal displacement occurs between the abutment 2 and the bridge girder 3, the stopper 52 becomes a part of the concave member 6. collide. In order to reduce the impact received by the stopper 52 at that time, a buffer material 54 can be attached around the stopper 52. The cushioning material 54 can be made of various materials such as chloroprene rubber, and various elastic materials including various resins can be selected.

  If the buffer material 54 is attached to the stopper 52, the buffer material 54 collides with a part of the recess material 6 instead of the stopper 52 when a relative horizontal displacement occurs between the abutment 2 and the bridge girder 3. The shock absorbing material 54 is elastically deformed by the impact force, and the impact energy is reduced by the deformation. As a result, the impact force received by the stopper 52 and the recess member 6 is also reduced.

  The buffer material 54 can be provided at any location between the stopper 52 and the recess material 6. FIG. 4 is a cross-sectional view illustrating the installation location of the cushioning material 54. 4A shows the cushioning material 54 attached to the outer peripheral surface (side surface) of the body of the stopper 52, and FIG. 4B shows the cushioning material 54 attached to the outer peripheral surface and upper surface of the body of the stopper 52. ing. FIG. 4C shows a case where the stopper extension portion 53 is provided on the stopper 52, and shows the cushioning material 54 attached to the outer peripheral surface of the trunk portion of the stopper 52 and the lower surface (back surface) of the stopper extension portion 53. Further, the buffer material 54 is not limited to being attached to the stopper 52, but can also be attached to the concave portion 6 as shown in FIG.

(Concave material)
FIG. 5 is a detailed view for explaining the concave member 6, (a) is a perspective view showing the concave member 6 in a state before the convex member 5 is engaged, and (b) is a diagram showing the convex member 5 engaged. It is a perspective view which shows the recessed part material 6 of a back state. FIG. 6B shows a state in which the recessed member 6 is installed as viewed from the bridge girder 3 side (that is, the upper side), and is actually not obstructed by the bridge girder 3. Abbreviated. As shown in this figure, the concave member 6 is composed of a plurality (two in the figure) of divided bodies 7.

  As shown in FIG. 5A, each divided body 7 is formed by a storage wall 71. Further, as shown in FIG. 5B, when the two accommodation walls 71 are combined, a space surrounded by the accommodation wall 71 (hereinafter referred to as “accommodation space 72”) is formed. The convex member 5 is engaged with the above. In FIG. 6B, the stopper 52 including the stopper extension 53 is engaged in the accommodation space 72. However, when the stopper extension 53 is not provided, the stopper 52 is engaged in the accommodation space 72. The Rukoto. The “engagement” here means a state in which a part or all of the stopper 52 or the like is accommodated.

  The receiving wall 71 is provided with a predetermined number (5 in the drawing) of bolt holes 71a penetrating therethrough. As shown in FIG. 2A, the concave member 6 is installed on the lower flange portion of the bridge girder 3. At this time, each of the two divided bodies 7 is bolted to the bridge girder 3 using the bolt holes 71 a of the receiving wall 71. These two divided bodies 7 are installed independently, and it is not necessary to connect the divided bodies 7 to each other. Specifically, as shown in FIG. 5 (b) and FIG. 6 (a), a separation S is provided between the two divided bodies 7, and each is separated and installed. In addition, the place where the recessed member 6 is installed is not limited to the lower flange, and can be any place of the bridge girder 3. The means for installing is not limited to bolt fixing, and various conventionally used means such as welding can be used. Can be adopted.

  FIG. 6 is a detailed view showing a state in which the displacement limiting device 1 is installed on the bridge girder 3. FIG. 6 (a) is a plan view of the installation state of the displacement limiting device 1 seen from below, and FIG. 6 (b) is a diagram. 6 (a) is a cross-sectional view taken along the line XX, and FIG. 6 (c) is a cross-sectional view taken along the line YY of FIG. 6 (a). As shown to Fig.6 (a), each division body 7 is exhibiting U shape by planar view. The divided body 7 is made of steel, and is manufactured in a U-shape with the housing wall 71 integrated. Alternatively, the three sides of the U-shape can be used as separate housing walls 71 and combined with welding or the like. The divided body 7 is made of steel, and various materials can be used as long as it satisfies the design requirements for strength.

  The shape of the divided body 7 is not limited to the U-shape, and can be various shapes other than the L-shape, and the concave member 6 is composed of four divided bodies 7 as shown in FIG. The number of divisions may be 3 or more.

  As shown in FIG. 6A, when the two divided bodies 7 are installed on the bridge girder 3, an accommodation space 72 surrounded by the accommodation wall 71 is formed. A stopper 52 including a stopper extension 53 is engaged in the housing space 72 as shown in FIG.

  As shown in FIG. 6 (c), a separation S is provided between the accommodation wall 71 of one divided body 7 and the accommodation wall 71 of the other divided body 7, and the two divided bodies 7 are separated. Installed. Further, these divided bodies 7 do not need to be connected to each other. In addition, when installing the division body 7 divided into four as shown in FIG. 7, it can also be set as the isolation | separation which does not connect all, and the division bodies 7 arranged in the bridge-axis direction (or bridge-axis perpendicular direction) mutually It is also possible to make a partial connection, such as connecting only.

  The width of the separation S provided between the divided bodies 7 can be arbitrarily designed, and can be set to a very small width so as to be substantially in contact with each other. In FIG. 6A, the divided bodies 7 are arranged in a direction perpendicular to the bridge axis, and two spaces S are provided in the bridge axis direction. It is also possible to arrange the bodies 7 in the bridge axis direction so that two spaces S are provided in a direction perpendicular to the bridge axis (an arrangement obtained by rotating FIG. 6A by 90 degrees).

  The divided body 7 may be provided with an obstacle plate 73 shown in FIGS. 5 (a) and 6 (a). The obstacle plate 73 is made of steel and is fixed to the divided body 7 by welding. When the recess member 6 is installed on the bridge girder 3, the stopper plate 73 is accommodated between the obstacle plate 73 and the bridge girder 3 (within the accommodation space 72). 6). The obstruction plate 73 can be made of steel, and various materials can be used as long as the design requirements on strength are satisfied. The obstruction plate 73 can also be manufactured as an integral part of the divided body 7. it can.

  When the recessed member 6 is installed on the bridge girder 3, the accommodation space 72 is formed by the accommodation wall 71 and the obstacle plate 73 (the range of the broken line in FIG. 9C), and the stopper extension 53 is formed as shown in FIG. 5B. It is accommodated in the accommodating space 72. As can be seen from FIG. 6B, since the gap formed between the two obstacle plates 73 is narrower than the width of the stopper extension 53, the stopper extension 53 can pass between the obstacle plates 73. In other words, the stopper extension 53 cannot come out downward from the accommodation space 72. In other words, the convex member 5 provided with the stopper extension 53 has a vertical movement range limited to the accommodation space 72 of the concave member 6, and as a result, the abutment 2 fixing the convex member 5 and the abutment 2. And the relative vertical displacement with the bridge girder 3 in which the recessed part material 6 was installed will be restrict | limited.

(Displacement limiting device)
The operation of the displacement limiting device 1 of the present invention will be described with reference to FIG. 8A is a model diagram for explaining the operation of the displacement limiting device 1 when relative horizontal displacement occurs between the abutment 2 and the bridge girder 3, and FIG. 8B is relative to the abutment 2 and the bridge girder 3. It is a model figure explaining the effect | action of the displacement limiting apparatus 1 when a vertical displacement arises.

First, the operation of the displacement limiting device 1 will be described with reference to FIG. When a horizontal load is applied to the bridge due to an earthquake or the like, the abutment 2 vibrates in the horizontal direction (arrow H direction), and the bridge girder 3 also vibrates in the horizontal direction. Usually, since the natural frequency of the abutment 2 and the bridge girder 3 is different, a relative horizontal displacement occurs between the abutment 2 and the bridge girder 3. On the other hand, the stopper 52 of the convex member 5 disposed in abutment 2, between the housing wall 71 of the concave member 6 installed on the bridge girder 3, the horizontal clearance [delta] _H is provided as shown in FIG. That is, when the relative horizontal displacement occurs between the abutment 2 and the bridge girder 3, (containing wall 71 or bridge beam 3 side) stopper 52 can be freely moved horizontally by the amount of horizontal clearance [delta] _H. In other words, the stopper 52 moves beyond the horizontal clearance [delta] _H, the stopper 52 or the stopper extension 53 (or the cushioning material 54 attached thereto) collide with the housing wall 71 (or disorder plate 73), The stopper 52 is blocked by the accommodation wall 71 (or the obstacle plate 73) and cannot move any further. Thus displacement limiting device 1, it is possible to limit the displacement of the stopper 52 (or housing wall 71) below the horizontal clearance [delta] _H, i.e. the relative horizontal displacement between the abutment 2 and the bridge girder 3 it is possible to limit below the horizontal clearance [delta] _H.

Next, the operation of the displacement limiting device 1 will be described based on FIG. When a vertical load is applied to the bridge due to an earthquake or the like, the abutment 2 vibrates in the vertical direction (arrow V direction), and the bridge girder 3 vibrates in the same vertical direction, and the relative vertical displacement between the abutment 2 and the bridge girder 3 Occurs. On the other hand, the stopper extension 53 of the projecting member 5 and between the fault plate 73 of the concave member 6, the vertical clearance [delta] _V is provided as shown in FIG. That is, when relative vertical displacement is generated between the abutment 2 and the bridge girder 3, (Failure plate 73 or bridge beam 3 side) stopper extension 53 may be freely vertically moved by the amount of vertical clearance [delta] _V. In other words, the stopper extension 53 moves beyond the vertical clearance [delta] _V, the stopper extension 53 may not be able to fault plate 73 is moved an obstacle more. Thus displacement limiting device 1, it is possible to limit the displacement of the stopper extension 53 (or disorder plate 73) below the vertical clearance [delta] _V, i.e. the relative vertical between the abutment 2 and the bridge girder 3 it is possible to limit the displacement below a vertical clearance [delta] _V.

(Installation procedure of displacement limiter)
A procedure for installing the displacement limiting device 1 of the present invention on an existing bridge will be described with reference to FIGS. In addition, the procedure demonstrated here is an example to the last, and the displacement limiting apparatus 1 of this invention does not necessarily have to be installed in this procedure. In addition, here, the bridge girder 3 is an I-shaped steel, and the case where the displacement limiting device 1 is installed on the lower flange of the I-shaped steel is illustrated, but of course, even when installed on the bridge girder 3 other than the I-shaped steel, This installation procedure can be adopted even when installing in a substructure such as the abutment 2.

  First, as shown in FIG. 9A, the divided body 7 constituting the concave member 6 is bolted to the bridge girder 3. At this stage, only a part of the plurality of divided bodies 7 constituting the concave member 6 is installed, and one divided body 7 (left side in the figure) is attached in the figure. In this way, a step of installing a part of the concave member 6, that is, one of the divided bodies 7 is called a primary concave portion installing step.

  Next, as shown in FIG. 9B, the convex member 5 is bolted to the abutment 2 (or a steel bracket provided on the abutment 2). The convex member 5 attached here is formed by integrally forming a steel fixing plate 51, a steel stopper 52, a steel stopper extension 53, and a cushioning material 54 made of chloroprene rubber.

  When the convex member 5 is installed on the abutment 2, it is necessary to arrange the convex member 5 at a predetermined position, that is, so that the stopper 52 is engaged in the accommodation space 72. In particular, when the stopper extension 53 is displaced downward, attention should be paid to the arrangement in which the obstacle plate 73 reliably becomes an obstacle and the displacement is limited. The process of installing the convex member 5 on the abutment 2 in this way is called a convex part installation process.

  Finally, as shown in FIG. 9 (c), the remaining divided body 7 constituting the concave member 6 is bolted to the bridge girder 3. The remaining divided bodies 7 are the divided bodies 7 excluding the divided bodies 7 attached in the first recess installation step, and the left divided bodies 7 are attached in the drawing. When the left divided body 7 is attached, the left divided body 7 is arranged so that the stopper 52 is engaged in the accommodating space 72. In addition, care should be taken so that the obstacle plate 73 is positioned below the stopper extension 53. Thus, the process of attaching the remaining divided body 7 and completing the installation of the recess material 6 is referred to as a secondary recess installation process.

  At this time, the divided body 7 attached in the first recessed portion installing step and the divided body 7 attached in the second recessed portion installing step are separately installed, for example, provided with a separation S. And it is not necessary to connect each division body 7 (left and right division bodies 7 in a figure) even after installing separately.

  Here, although the method of attaching in order of a primary recessed part installation process, a convex part installation process, and a secondary recessed part installation process was shown, it replaces with this and a primary recessed part installation process is carried out after a convex part installation process. It can also be attached in the order of the secondary recess installation step. In this case, it is not necessary to consider that the stopper 52 is engaged in the accommodation space 72, and the convex member 5 is simply bolted to the abutment 2 (or a steel bracket provided on the abutment 2). Fix it. On the other hand, in the first recessed portion installation step, it is necessary to arrange the divided body 7 so that the stopper 52 is engaged in the accommodation space 72. Considering this point, the divided body 7 (only a part of the plurality of divided bodies 7 constituting the concave member 6) is bolted to the bridge girder 3. Of course, in this case as well, it is not necessary to connect the divided bodies 7 installed separately (installed in the primary recess installation process and the secondary recess installation process).

  According to the installation procedure shown here, it is not necessary to install the displacement limiting device 1 in a state where the convex member 5 and the concave member 6 are combined in advance (a state where the stopper 52 is engaged in the accommodation space 72). Installation work becomes extremely easy. In addition, since the concave member 6 is divided, the compact and lighter divided body 7 is handled than before, so that the workability is improved and the work can be safely performed even in a narrow work space. is there. In addition, although the installation procedure was demonstrated here, since the same effect is produced also when removing, replacement | exchange is easy and it is excellent also in maintainability.

The displacement limiting device installation method, bridge girder displacement limiting structure, and displacement limiting device of the present invention can be used for various bridges such as road bridges, railway bridges, river bridges and viaducts. Further, the present invention is not limited to the connection between a supporting girder and a bridge girder such as a bridge girder and an abutment, and can be applied by attaching between various structures such as a tunnel gate, a retaining wall, or a building structure such as a building.

DESCRIPTION OF SYMBOLS 1 Displacement restriction device 2 Abutment 3 Bridge girder 4 Bearing 4a Fixed bearing 4b Movable bearing 5 Convex member 51 Fixed plate 51a (fixed plate) Bolt hole 52 Stopper 53 Stopper extension 54 Buffer material 6 Concave material 7 Divided body 71 Housing wall 71a ( Bolt hole 72 in the receiving wall
73 Obstacle plate Br Bracket S Separation δ _H Horizontal clearance δ _V Vertical clearance

Claims (12)

Installed in a support space between a support frame such as an abutment or pier and a bridge girder supported by a support on it, and the horizontal displacement of the bridge girder and the support frame in the horizontal direction or upward in the horizontal and vertical directions In a method of installing a displacement limiting device capable of limiting the relative displacement of
The displacement limiting device includes a convex member and a concave member, the convex member includes a stopper, the concave member includes two or more divided bodies, and each of the divided bodies can enclose a part of the outer periphery of the stopper. A convex member is fixed to one of the bridge girder and the support case, and a concave member is fixed to the other of the bridge girder and the support case, and the convex member is fixed to the other of the bridge girder and the support case. The relative displacement of the bridge girder and the support frame can be limited by the recess material,
A projecting member installation step of disposing the projecting member of the displacement limiting device from the side to the support space and fixing it to either the bridge girder or the support housing;
After the convex member is installed and fixed by the convex member installation step, two or more divided parts of the concave member are individually provided in the support space from the side of the support space and outside the stopper of the convex member. By arranging and fixing to the other one of the bridge girder and the support frame, and performing this arrangement and fixation by the number of divided bodies, the outer side of the stopper of the convex member is surrounded by the housing wall of the two or more divided bodies and the stopper Comprising a step of providing a gap between the outer peripheral surface and the inner peripheral surface of the accommodating recess of the divided body,
An installation method of a displacement limiting device characterized by the above. Installed in a support space between a support frame such as an abutment or pier and a bridge girder supported by a support on it, and the horizontal displacement of the bridge girder and the support frame in the horizontal direction or upward in the horizontal and vertical directions In a method of installing a displacement limiting device capable of limiting the relative displacement of
The displacement limiting device includes a convex member and a concave member, the convex member includes a stopper, the concave member includes two or more divided bodies, and each of the divided bodies can enclose a part of the outer periphery of the stopper. A convex member is fixed to one of the bridge girder and the support case, and a concave member is fixed to the other of the bridge girder and the support case, and the convex member is fixed to the other of the bridge girder and the support case. The relative displacement of the bridge girder and the support frame can be limited by the recess material,
A split body installation step of disposing a partial split body of the displacement limiting device in the support space from the side of the support space and fixing it to either the bridge girder or the support housing;
After the divided body is installed and fixed by the divided body installation step, the convex member of the displacement limiting device is disposed in the support space from the side of the support space and inside the housing recess of the divided body, and the bridge girder. A convex member installation step for fixing to either one of the support housings;
A part of the divided body is installed and fixed by the divided body installation step, and then the convex member is installed and fixed by the convex member installation step, and then the convex member is located in the support space from the side of the support space. By placing another divided body on the outside of the stopper and fixing it to the bridge girder or the support frame on which the divided body is fixed first, the outer periphery of the stopper is formed by this divided body and the divided body that has been previously fixed. The step of enclosing and providing a gap between the outer peripheral surface of the stopper and the inner peripheral surface of the housing recess of the divided body,
An installation method of a displacement limiting device characterized by the above. Installed in a support space between a support frame such as an abutment or pier and a bridge girder supported by a support on it, and the horizontal displacement of the bridge girder and the support frame in the horizontal direction or upward in the horizontal and vertical directions In a displacement limiting device capable of limiting the relative displacement of
The displacement limiting device includes a convex member and a concave member, the convex member includes a fixed plate and a stopper protruding vertically from the fixed plate, the concave member includes two or more divided bodies, and each divided body includes A housing wall capable of enclosing a part of the outer periphery of the stopper and a housing recess inside thereof,
The convex member can be arranged in the support space from the side of the support space and fixed to either the bridge girder or the support frame,
The recessed member divided body can be individually arranged in the support space from the side thereof and fixed to either the bridge girder or the supporting frame to surround the outer periphery of the stopper with two or more divided bodies,
The housing recesses of the two or more divided bodies are wide enough to create a gap between the outer peripheral surface of the stopper and the inner peripheral surface of the housing wall of the divided body by surrounding the outer periphery of the stopper,
The recess material in which the two or more divided bodies are arranged and fixed, and the stopper surrounded by the recess material collide with each other when the bridge girder and the supporting frame collide in the horizontal direction or in the horizontal direction and the vertical direction, and the relative displacement occurs. Can be restricted,
A displacement limiting device characterized by that. The displacement limiting device according to claim 3,
The stopper of the convex member is prismatic, the inner surface of the accommodating recess of the divided body is flat, and the inner surface of the accommodating recess is in surface collision with the outer peripheral surface of the stopper when a horizontal relative displacement occurs.
A displacement limiting device characterized by that. In the displacement limiting device according to claim 3 or 4 ,
On the tip side of the stopper, there is provided a stopper extension that projects horizontally to the outside of the outer peripheral surface of the stopper,
By dividing and fixing two or more of the divided bodies in the support space, the outer periphery of the stopper and the lower part of the stopper extension can be enclosed.
A displacement limiting device characterized by that. The displacement limiting device according to any one of claims 3 to 5 ,
The divided body is provided with an obstacle plate, and the obstacle plate is projected horizontally from the accommodating wall of the divided body into the accommodating recess so that it can collide with the outer peripheral surface of the stopper when the relative displacement in the horizontal direction occurs.
A displacement limiting device characterized by that. The displacement limiting device according to any one of claims 3 to 6,
Equipped with an elastic cushioning material on either the outer periphery of the stopper or the tip of the obstacle plate,
A displacement limiting device characterized by that. Displacement that can limit the horizontal or horizontal and vertical relative displacement between the bridge girder and the support frame in the support space between the support frame such as abutment and pier and the bridge girder supported by the support. In the bridge girder displacement restriction structure with a restriction device installed,
The displacement limiting device according to claim 3,
The convex member of the displacement limiting device is installed in the support space between the bridge girder and the support housing, fixed to either the bridge girder or the support housing, and the stopper of the convex member protrudes into the support space,
Two or more divided bodies are installed in the support space, fixed to either the bridge girder or the support housing, and the outer periphery of the stopper is surrounded by the housing wall of the divided bodies, so that the outer peripheral surface of the stopper and the divided body are accommodated. A gap is formed between the inner surface of the recess,
When the relative displacement between the bridge girder and the support frame occurs, the two or more divided bodies and the stopper surrounded by them collide, and the relative displacement is limited.
Displacement limiting structure of bridge girder characterized by that. Displacement that can limit the horizontal or horizontal and vertical relative displacement between the bridge girder and the support frame in the support space between the support frame such as abutment and pier and the bridge girder supported by the support. In the bridge girder displacement restriction structure with a restriction device installed,
The displacement limiting device according to claim 4, wherein the stopper has a prismatic shape,
The convex member of the displacement limiting device is disposed in a support space between the bridge girder and the support frame, and is fixed to either the bridge girder or the support frame, and the prismatic stopper of the convex member protrudes into the support space,
Two or more divided bodies are arranged in the support space, fixed to one of the bridge girder and the support housing, and the outer periphery of the prismatic stopper is surrounded by the housing wall of the divided bodies. A gap is formed between the surface and the inner surface of the accommodating recess of the divided body,
When the relative displacement between the bridge beam and the support frame occurs, the two or more divided bodies and the prismatic stopper surrounded by them collide with each other, and the relative displacement is limited.
Displacement limiting structure of bridge girder characterized by that. Displacement that can limit the horizontal or horizontal and vertical relative displacement between the bridge girder and the support frame in the support space between the support frame such as abutment and pier and the bridge girder supported by the support. In the bridge girder displacement restriction structure with a restriction device installed,
The displacement limiting device according to claim 5, wherein the convex member is a displacement limiting device provided with a stopper extension.
The convex member is disposed in the support space between the bridge girder and the support housing, fixed to either the bridge girder or the support housing, and the stopper of the convex member protrudes into the support space,
Two or more divided bodies are arranged in the support space and fixed to either the bridge girder or the support housing, and the outer periphery of the stopper is surrounded by the housing walls of the two or more divided bodies below the stopper extension. A gap is formed between the stopper and the inner surface of the accommodating recess of the divided body,
The two or more divided bodies, the stopper and the stopper extension portion are structured to collide when the relative displacement occurs between the bridge girder and the support housing and to limit the relative displacement.
Displacement limiting structure of bridge girder characterized by that. It is possible to limit the horizontal displacement of the bridge girder and the support frame in the horizontal direction or the horizontal and vertical directions in the support space between the support frame such as the abutment and the pier and the bridge girder supported by the support. In the bridge girder displacement restriction structure with displacement restriction device installed,
The displacement limiting device according to claim 6, wherein the divided body is a displacement limiting device including an obstacle plate,
A convex member is installed in a support space between the bridge girder and the support housing, fixed to either the bridge girder or the support housing, and a stopper of the convex member is protruded into the support space,
Two or more divided bodies are installed in the support space and fixed to either the bridge girder or the support frame, and the outer periphery of the stopper is surrounded by the two or more divided body receiving walls and obstacle plates, A gap is formed between the divided body and the containing wall and the obstacle plate,
The obstacle plate and the stopper of the two or more divided bodies collide with each other when the relative displacement occurs between the bridge girder and the support frame, and the relative displacement is limited.
Displacement limiting structure of bridge girder characterized by that. The horizontal displacement of the bridge girder and the support frame in the horizontal direction or the horizontal and vertical directions is supported in the support space between the support frame such as the abutment and the pier and the bridge girder supported and installed on the support frame. In the bridge girder displacement restriction structure with a displacement restriction device that can be restricted,
The displacement limiting device according to claim 7, wherein any one of the divided body and the stopper is provided with a cushioning material,
The convex member is installed in the support space between the bridge girder and the support housing, and is fixed to either the bridge girder or the support housing, and the stopper of the convex member is protruded in the support space,
Two or more divided bodies are installed in the support space and fixed to one of the bridge girder and the support frame, and the stopper is surrounded by the two or more divided body receiving walls to accommodate the stopper and the divided body. A gap is formed between the inner surface of the recess,
The relative displacement is limited by the impact of the buffer material of the stopper and the inner surface of the receiving recess of the two or more divided bodies, or the buffer material of two or more divided bodies and the outer peripheral surface of the stopper when the relative displacement occurs Is the structure
Displacement limiting structure of bridge girder characterized by that.

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