JPH06272216A - Rubber support for steel bridge - Google Patents

Abstract

PURPOSE:To obtain a simple support structure in a rubber support for a steel bridge, by which floating of an upper structure from a lower structure caused by upward lift can be effectively prevented while displacement in all directions to the bridge pier of a bridge is absorbed without sacrificing the advantage of a rubber support. CONSTITUTION:A connecting steel plate 4 and a lower flange 2 are respectively integrally fixed to the upper part and the lower part of a rubber support main body 1 formed by alternately stacking a metal plate 10 and a rubber layer 11. The connecting steel plate 4 and the upper structure such as a bridge 9 or the like are fixed to each other by a connecting means 7, and the lower flange 2 and the lower structure such as a bridge pier 9 or the like are fixed to each other through a frame metal fitting 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure support for civil engineering and construction, and more particularly to a rubber support for a steel bridge used for supporting a steel bridge on a pier, ,
It is intended to provide a simple support structure that makes full use of the characteristics of a rubber bearing that can absorb displacements in all directions.

[0002]

2. Description of the Related Art Conventionally, a rubber bearing member which is generally used for supporting a structure for civil engineering and construction is arranged between an upper structure and a lower structure. Since these structures are extremely heavy, there is no particular inconvenience even if no special connecting means is used between these structures and the rubber support. However, in a bridge structure in which the bridge 9 is placed on the bridge pier 12 with the rubber bearing body 1 interposed as shown in FIG. 7, normally, as shown in FIG. Due to the earthquake, a force indicated by an arrow F shown in the figure, that is, an upward lift force acts on the rubber bearing body 1. For this reason, in concrete girder bridges, anchor bars embedded deep enough in the upper structure are used to hold the structure by the upper lift, and prevent the upper structure from rising above the lower structure. There is. Further, in the case of a structure such as a steel girder bridge in which an anchor bar or the like cannot be embedded, by adopting a structure as shown in FIG. I was trying to prevent the rising of.

The conventional example shown in FIGS. 4 to 6 will be described in detail. Basically, metal plates having upper and lower flanges 33 and 22 fixed to upper and lower parts and rubber layers are alternately laminated. The constructed rubber bearing main body 21 is simply clamped between an upper structure such as a bridge and a lower structure such as a bridge pier without being fixed to them, and supports a large weight upper structure such as a bridge. is doing. The upper structure side such as a bridge is connected and fixed to the lower part of the steel bridge 29 by screwing the upper bolts 24, 25 with a set bolt 27 as a connecting tool. On the other hand, on the lower structure side of the bridge pier or the like, the lower shoe 23 is fixed via an anchor bolt 26 embedded in the pier or the like, and the rubber bearing main body 21 is placed on the lower shoe 23. As is apparent from FIGS. 4 and 5, a part of both side surfaces parallel to the bridge axis is erected on the lower shoe 23, and a side block 30 is fixed to the erected surface 34 by a side block bolt 31. ing. The side block 30 has an inverted L-shaped cross section.
As is apparent from the plan view of FIG.
Is in contact with the upper surface of the stepped portion 32. Therefore, the side block 30 restrains the step portion 32 of the upper shoe 24 from preventing the upper structure from being lifted up from the lower structure due to the deflection of a passing vehicle or the upper lift generated by an earthquake. In addition, 28 is a rubber bearing main body 21
And a shear key inserted between the upper structure and the lower structure to transmit a shear force in the bridge axis direction and in the direction orthogonal to the bridge axis. However, as is apparent from FIG. 5, the side block 30 is in contact with and restrained by the upper shoe 24, which causes a problem that the vibration in the direction perpendicular to the bridge axis cannot be sufficiently absorbed.

[0004]

As described above, in order to prevent the upper structure from being lifted up from the lower structure due to the bending of a passing vehicle or the upper lift force caused by an earthquake, in the support portion for the bridge pier of the bridge, as described above. In the support device for the structure of, in addition to the rubber support,
Not only do many steel parts are required, but the provision of these parts has the disadvantage that the characteristic of being able to absorb displacement in all directions, which is an advantage of the rubber bearing, cannot be fully utilized. For this reason, it is possible to prevent displacement of the bridge in all directions with respect to the bridge pier without sacrificing the advantages of the rubber bearing, and to effectively prevent the upper structure from being lifted up from the lower structure by the lift force. The advent of support structures was strongly desired.

[0005]

Therefore, in the present invention, in order to solve the above-mentioned conventional problems required for a support portion for a bridge pier of a bridge using a rubber support, a metal plate and a rubber layer are alternately arranged. The connecting steel plate and the lower flange are integrally fixed to the upper and lower portions of the rubber bearing main body formed by stacking them on each other, and the connecting steel plate and the upper structure such as a bridge are fixed by a connecting tool, and the lower flange and the pier are fixed. It is designed to be fixed to a lower structure such as through a frame fitting, and the connecting steel plate and the lower flange may be buried by being covered with a rubber layer, or may be connected to an upper structure such as the bridge. A sole plate is interposed between the steel plates, and a shear key is inserted across the connecting steel plate and the sole plate. The connecting steel plate is tapped for a connecting tool.

[0006]

[Operation] By constructing the rubber bearing in the bearing portion for the bridge pier as described above, the bending and displacement caused by the influence of the weight and the acceleration due to the earthquake, the strong wind, or the vehicle passing over the bridge will cause the shearing of the rubber bearing. It is effectively absorbed by the directional cushioning action, and the vertical vibration is also sufficiently absorbed by the cushioning action of the rubber bearing body. In particular, the lifting of the upper structure with respect to the lower structure due to the lifting force should be sufficiently suppressed by the vertical pulling resistance between the strong layers of the rubber bearing body, which is constructed by alternately stacking metal plates and rubber layers. Is what makes it possible. In addition, there is no shearing key or projections such as bosses on the lower flange side, the upper flange is also abolished, and a complicated structure such as a side block is not required, so that a rubber bearing can be mounted with a simple structure. An extremely useful rubber support for a steel bridge is provided, which can be easily removed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of a rubber support for a steel bridge of the present invention, FIG. 1 is a front view of a partial cross section, FIG. 2 is the same side view,
FIG. 3 is a plan view of the same. A connecting steel plate 4 and a lower flange 2 are integrally fixed to an upper portion and a lower portion of a rubber bearing main body 1 configured by alternately laminating metal plates 10 and rubber layers 11. The connecting steel plate 4 and the lower flange 2 may be embedded by being covered with a rubber layer. By doing so, since the metal part is not exposed to the outside, the life as a rubber support for a steel bridge can be remarkably extended. Further, as the metal plate 10, a steel plate having excellent compression resistance is suitable, but other materials may be used, and further, a hard plastic plate material or the like may be used as long as it has excellent compression resistance. As the rubber layer 11 as an elastic material that is alternately laminated with the metal plate, a material containing natural rubber as a main component or a viscoelastic polymer material in a plate shape is used. The metal plate 10 and the rubber layer 11 may have a rectangular shape as shown in FIG. 3, or may have a disc shape or any other suitable shape according to the installation form. The connecting steel plate 4 and the upper structure such as the bridge 9 are fixed by a connecting tool such as a set bolt 7 with a sole plate 5 interposed. Connection steel plate 4
Is tapped for the set bolt 7, and the set bolt 7 from the bridge 9 is screwed into the tapped portion to fix the bridge 9 as the upper structure and the rubber bearing main body 1.
It goes without saying that other appropriate structures can be adopted as these connecting tools. The connecting steel plate 4 and the sole plate 5
A shear key 8 is inserted between the rubber bearing main body 1 and the sole plate 5 to transmit a force in the shearing direction.

On the other hand, the lower flange 2 fixed to the lower portion of the rubber bearing body 1 is fixed to the lower structure such as the pier 12 through the frame fitting 3. The frame metal fitting 3 is tightly fixed to an anchor bolt 6 deeply embedded in the bridge pier 12 with a nut, or a set bolt or the like is attached to a base plate such as a steel plate embedded in a lower structure such as a bridge pier. May be fixed by. As shown in FIG. 1, the frame fitting 3 has an inverted L-shaped cross section that holds the exposed upper surface and the end surface on both sides of the lower flange 2, or as shown in FIG. Recess 1 for enclosing and holding in the shape of a circle
3 is provided. This allows the lower flange 2 to be securely held and restrained from the front, rear, left and right, and a rubber support for a steel bridge can be attached to a lower structure such as a pier without particularly opening bolt holes in the lower flange 2. It can be fixed. In the present invention, the lower flange 2 is fixed to the lower structure such as a bridge pier via the frame fitting 3, but it goes without saying that various suitable shapes can be adopted for the frame fitting. It is also possible to use an appropriate fixing tool as long as it is a fixing method that does not allow it to float up.

[0009]

The rubber bearing main body 1 of the rubber bearing for a steel bridge according to the present invention thus constructed has a bending and displacement caused by an influence of an earthquake, a strong wind, or a weight and acceleration of a vehicle passing over the bridge. The rubber bearing body 1 is effectively absorbed by the buffering action in the shearing direction, and the lifting of the upper structure with respect to the lower structure due to the lifting force is formed by alternately laminating the metal plates 10 and the rubber layers 11. Since it is possible to sufficiently suppress the tensile resistance in the vertical direction between the strong layers of No. 1, it is possible to effectively absorb the displacement in any direction with respect to the bridge and the bridge pier. In addition, there is no shearing key or protrusions such as bosses on the lower flange 2 side, the upper flange is also abolished, and a complicated structure such as a side block is not necessary, so that the rubber bearing can be mounted with a simple structure. ,
It will be easy to remove. Furthermore, frame fitting 3
Since it is possible to attach the lower flange 2 to a lower structure such as a bridge pier, it is not necessary to open a bolt hole or the like in the lower flange 2 so that the degree of freedom in attachment can be increased and the lower flange can be attached. The strength of 2 itself does not decrease. Thus, in the rubber support for a steel bridge of the present invention,
In addition to the rubber bearing, it does not require a large number of steel parts and does not sacrifice the advantage of the rubber bearing that it can absorb displacements of the bridge in all directions with respect to the bridge pier, but it does It is possible to provide a simple supporting structure characteristic that can effectively prevent the structure from being lifted.

[Brief description of drawings]

FIG. 1 is a front view of a partial cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a side view of a partial cross section of FIG.

FIG. 3 is a plan view of a partial cross section of FIG.

FIG. 4 is a partial cross-sectional front view showing a conventional rubber support for a steel bridge.

5 is a side view of a partial cross section of FIG. 4. FIG.

FIG. 6 is a plan view of a partial cross section of FIG.

FIG. 7 is a drawing showing a bridge and a bridge pier using a rubber support for a steel bridge.

FIG. 8 is a drawing for explaining an uplift force when a rubber support for a steel bridge is displaced.

[Explanation of symbols]

 1 Rubber Bearing Main Body 2 Lower Flange 3 Frame Metal Fitting 4 Connection Steel Plate 5 Sole Plate 6 Anchor Bolt 7 Set Bolt 8 Shear Key 9 Bridge 10 Metal Plate 11 Rubber Layer 12 Bridge Pier 13 Recess

[Procedure amendment]

[Submission date] April 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Conventionally, a rubber bearing member which is generally used for supporting a structure for civil engineering and construction is arranged between an upper structure and a lower structure. Since these structures are extremely heavy, there is no particular inconvenience even if no special connecting means is used between these structures and the rubber support. However, the rubber bearings in the main body 1 by interposing the bridge structure bridges 9 placed on the piers 12, as shown in FIG. 7, usually, as shown in FIG. 8, supported
Due to an upward force that may occur due to the arrangement of the bearings or an earthquake, a force as shown by an arrow F in FIG. For this reason, the concrete girder bridge, by sufficiently deeply buried anchor bar up or down unit structure performs holding of the structure in accordance with the upper lift, due to the lifting of the upper structure to the lower structure
I try to prevent it from falling . In the case of structures such as anchor girders that cannot be embedded like steel girder bridges, see Fig. 4.
By adopting the structure as shown in Fig .
Performs holding of to that structure, has been to prevent the lifting of the upper structure to the lower structure.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

The conventional example shown in FIGS. 4 to 6 will be described in detail. Basically, metal plates having upper and lower flanges 33 and 22 fixed to upper and lower parts and rubber layers are alternately laminated. The constructed rubber bearing main body 21 is simply clamped between an upper structure such as a bridge and a lower structure such as a bridge pier without being fixed to them, and supports a large weight upper structure such as a bridge. is doing. The upper structure side such as a bridge is connected and fixed to the lower part of the steel bridge 29 by screwing the upper bolts 24, 25 with a set bolt 27 as a connecting tool. On the other hand, on the lower structure side of the bridge pier or the like, the lower shoe 23 is fixed via an anchor bolt 26 embedded in the pier or the like, and the rubber bearing main body 21 is placed on the lower shoe 23. As is apparent from FIGS. 4 and 5, a part of both side surfaces parallel to the bridge axis is erected on the lower shoe 23, and a side block 30 is fixed to the erected surface 34 by a side block bolt 31. ing. The side block 30 has an inverted L-shaped cross section.
As is apparent from the plan view of FIG.
Is in contact with the upper surface of the stepped portion 32. Therefore, mainly
The side block 30 restrains the step portion 32 of the upper shoe 24 from lifting up the upper structure from the lower structure due to the upper lift force generated by the earthquake. Reference numeral 28 denotes a shearing key inserted between the rubber bearing main body 21 and the upper structure and the lower structure, for transmitting shearing force in the bridge axis direction and the direction orthogonal to the bridge axis. However, as is apparent from FIG. 5, the side block 30 is in contact with and restrained by the upper shoe 24, which causes a problem that vibration and displacement in the direction perpendicular to the bridge axis cannot be sufficiently absorbed.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

As described above, in the support portion for the bridge pier of the bridge, in order to prevent the upper structure from being lifted up from the lower structure mainly due to the lift force generated by the earthquake, the conventional structure support is used. The device not only requires many steel parts in addition to the rubber support, but by providing these parts, it is possible to absorb the displacement in all directions, which is an advantage of the rubber support. There was an inconvenience that we could not make the most of it. For this reason, it is possible to prevent displacement of the bridge in all directions with respect to the bridge pier without sacrificing the advantages of the rubber bearing, and to effectively prevent the upper structure from being lifted up from the lower structure by the lift force. The advent of support structures was strongly desired.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of a rubber support for a steel bridge of the present invention, FIG. 1 is a front view of a partial cross section, FIG. 2 is the same side view,
FIG. 3 is a plan view of the same. A connecting steel plate 4 and a lower flange 2 are integrally fixed to an upper portion and a lower portion of a rubber bearing main body 1 configured by alternately laminating metal plates 10 and rubber layers 11. The connecting steel plate 4 and the lower flange 2 may be embedded by being covered with a rubber layer. By doing so, since the metal part is not exposed to the outside, the life as a rubber support for a steel bridge can be remarkably extended. Further, as the metal plate 10, a steel plate having excellent compression resistance is suitable, but other materials may be used, and further, a hard plastic plate material or the like may be used as long as it has excellent compression resistance. As the rubber layer 11 as an elastic material that is alternately laminated with the metal plate, a material containing natural rubber as a main component, a synthetic rubber, or a viscoelastic polymer material in a plate shape is used. The metal plate 10 and the rubber layer 11 are
As shown in FIG. 3, it may be a square shape, or a disc shape or the like.
An appropriate shape is adopted according to the installation form. The connecting steel plate 4 and the upper structure such as the bridge 9 are fixed by a connecting tool such as a set bolt 7 with a sole plate 5 interposed.
The connecting steel plate 4 is tapped for the set bolt 7, and the set bolt 7 from the bridge 9 is screwed into the tapped portion to fix the bridge 9 as the upper structure and the rubber bearing main body 1. It goes without saying that other appropriate structures can be adopted as these connecting tools. A shear key 8 is inserted between the connecting steel plate 4 and the sole plate 5 to transmit a force in the shear direction between the rubber bearing body 1 and the sole plate 5.

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

Claims (5)

[Claims] 1. A connecting steel plate and a lower flange are integrally fixed to an upper part and a lower part of a rubber bearing main body formed by alternately laminating metal plates and rubber layers, and the connecting steel plate and an upper structure such as a bridge. Is fixed by a connecting tool, and the lower flange and a lower structure such as a bridge pier are fixed via frame fittings. 2. The rubber bearing for a steel bridge according to claim 1, wherein the connecting steel plate and the lower flange are covered and buried with a rubber layer. 3. The rubber bearing for a steel bridge according to claim 1, wherein a sole plate is interposed between the upper structure such as the bridge and the connecting steel plate. 4. The rubber support for a steel bridge according to claim 1, wherein a shear key is inserted across the connecting steel plate and the sole plate. 5. The rubber bearing for a steel bridge according to claim 1, wherein the connecting steel plate is tapped for a connecting tool.