JP3146259B2 - Bridge bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge bearing device, and more particularly to a bridge bearing device having a distributed structure and a seismic isolation structure.

[0002]

2. Description of the Related Art There are many steel bearings (steel shoes) in an existing support structure of a bridge for an abutment or a pier. However, after the recent Hanshin Earthquake, a review of the seismic structure for the bridge support structure has been carried out. It is conducted on a nationwide scale, and its bearing structure is
If it is found that it cannot withstand an earthquake on the scale of the Great Hanshin Earthquake, the bearings are being replaced one after another.

[0003] The conventional bridge bearing device cannot be said to be a structure that can sufficiently cope with the new road sign, and therefore, most of the bearing structures have to be replaced with a bearing that satisfies the conditions of the new road sign. It is. In addition, replacement of old and new bearings is performed in a narrow work space between the bridge and the substructure such as abutments and piers, so there is a problem in construction, and furthermore, the distributed structure and the long period of the shaking in the event of bridge earthquakes Strict conditions such as seismic isolation and no joint between the bridge and the bearing device are required, so an idea fundamentally different from the conventional (existing) bearing structure is required.

As a result of various studies, the present inventors have confirmed that the following conditions are required for a bearing device for replacing an existing bearing. Bearing thickness A structure that can be processed within the thickness of the conventional bearing. Elastic support A structure that can elastically support the load of the bridge as much as possible. Longer period The bridge shall be capable of seismic isolation by extending the period in the direction of the bridge axis. Continuation The bridge shall have no joint to the bearing device, and the structure shall be continuous in the bridge axis direction. Countermeasures against lifting force The structure should be able to support the lifting force of the bridge up to 0.3Rd. Simplified bearing replacement type A structure that allows replacement of bearing parts by simple replacement work. Elastic support and seismic isolation in the direction perpendicular to the bridge axis The structure must be elastic support in the direction perpendicular to the bridge axis to absorb shocks and seismic isolation. Responding to expansion and contraction due to temperature changes A structure that can cope with expansion and contraction of bridges due to temperature changes.

An object of the present invention is to provide a bridge support device which can satisfy the above-mentioned conditions to the maximum based on the above-mentioned examination results and is useful even when used as a support device in a newly installed bridge support. .

Here, an example of the prior art is shown in FIGS.
(The details of this are described in
325). In each of the figures, an intermediate portion of a steel bearing plate 2 provided with locking projections 1 on both front and rear portions on both left and right sides is fixed to a lower flange 16 of a steel girder 3 extending in the front-rear direction. A rubber bearing 6 is interposed between the plate 2 and a steel base 5 fixed on the upper part of the support structure 4.

A steel support member 9 having a support upper surface 7 and a lateral pressure support protrusion 8 is fixed to both left and right sides of the steel base plate 5, and the height of the pressing member is adjusted on the support upper surface 7. The elastic spacer 11 for lateral pressure buffering support is provided between the steel holding member 10 and the projection 8 for lateral pressure bearing placed via the seat plate 17 for use.
Is interposed.

The lateral pressure bearing surface 12 of the steel holding member 10
Is brought into contact with the side surface of the support plate 2 and the steel holding member 1
No. 0 upper bearing portion 13 faces the upper surface of the bearing plate 2, and the steel holding member 10 is attached to the steel bearing member 9 by mounting bolts 14, and at both front and rear ends of the steel bearing member 9,
A play adjusting elastic support member 15 for adjusting a play in the bridge axis direction with the locking projection 1 is attached.

[0009]

According to the above-mentioned conventional structure, vibrations in all directions, such as the direction of the bridge axis, the direction perpendicular to the bridge axis, and the rotation of the superstructure during a large earthquake, are absorbed.
There is still room for improvement in terms of providing a structure that can sufficiently cope with large swings.

The present invention is an improvement of the prior art, and as described above, a bridge bearing device which can satisfy the above conditions as much as possible and is useful as a bearing device in a newly installed bridge bearing. To provide.

[0011]

[SUMMARY OF] To solve the above problems the present invention provides a bridge for a bearing device for supporting a lower structure through a load bearing elastic support member upper structure, before
Non-load-bearing connection between upper and lower structures
Cushioning member that absorbs the omnidirectional vibration of the upper structure
And the upper structure is slidably supported in the horizontal direction.
The load-bearing elastic bearing members in a direction perpendicular to the bridge axis.
The cushioning member is provided at an interval,
A plurality of hanging support members of the upper support frame fixed to
Multiple uprights of lower support frame fixed to undercarriage
With the holding member with a gap in the horizontal direction.
In the horizontal gap, the vertical direction and the horizontal direction of the upper structure
Compression deformation due to omnidirectional vibration in the rotation direction
And the superstructure to prevent shear bridges due to shear deformation.
An elastic member for supporting the movable member;
The supporting member is fixed to the holding member and the upright supporting member,
The rubber pressure plate that constitutes the elastic support member is
Stored in the support wall provided on the fixed base plate,
An upper surface of an upper metal plate provided on the rubber supporting plate;
Friction sliding support surface with said superstructure with rating
And the upper structure is supported .

According to the present invention, the load on the bridge and the vertical vibration during the earthquake are buffered by the load-bearing elastic bearing member, and the vibration in the bridge axis direction and the vibration in the direction perpendicular to the bridge axis during the earthquake are suppressed by the upper structure. Dispersion and seismic isolation occur due to frictional sliding between the object and the load-bearing elastic bearing member, and the elastic deformation of the cushioning member at that time. This works together to provide elastic support. further,
Because of the above structure, the vertical dimension of the bearing device does not increase, and the bearing device is accommodated in the installation space of the existing bearing device.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 11 show a first embodiment of the present invention.
1 is a longitudinal sectional view showing a bridge bearing device 18 installed on the upper surface of a substructure 17 such as an abutment or a pier, and FIG.
It is A sectional drawing. The bearing device 18 includes a load supporting elastic bearing member 27 and a cushioning member 34. A steel girder 19 made of H-shaped steel as an upper structure constituting a bridge such as a road bridge is supported in parallel by the elastic bearing member 27, and a floor slab 20 is supported by the steel girder 19. In addition, the cushioning member 34 buffers the horizontal structure, the upward lift, and the rotational force of the upper structure in all directions. Further, between the left and right steel girders 19 is connected and reinforced by a connecting beam 21. 3 and 4 show the elastic bearing member 27 shown in FIG.
5 and 6 are an enlarged side view and a cross-sectional view of the cushioning member 34, and FIGS. 7 to 11 are component diagrams.

As shown in FIGS. 1 to 4, in the load-bearing elastic bearing member 27, the base plate 22
And is fixed to the upper surface of the lower structure 17 by the anchor member 24 via the. The base plate 22 is a long-sided steel plate that is long in the direction perpendicular to the bridge axis.
At the center of the upper surface, a rectangular support wall 25 for accommodating a support member that is rectangular when viewed from above is fixed by welding.

A load supporting elastic support member 27 is housed inside the surrounding support wall 25 on the upper surface of the base plate 22. The elastic bearing member 27 is fixed to a rubber supporting plate 27a having a predetermined thickness, a lower metal plate 27b made of a thin steel plate fixed to the lower surface of the rubber supporting plate 27a, and an upper surface of the rubber supporting plate 27a. The pressure plate 27a and the upper metal plate 27c made of a stainless steel plate having substantially the same thickness. On the upper surface of the upper metal plate 27c, a thin four
An ethylene nitride layer 28 is adhered and formed. FIG.
The height H1 of the elastic support member 27 is set to be slightly higher than the height H of the surrounding support wall 25 for accommodating the elastic member, and the elastic support member including the upper metal plate 27c is provided. 27 is restricted in the horizontal direction. Further, a rubber elastic deformation allowable space 35 is formed between the rubber supporting plate 27a and the surrounding wall 25.

In the elastic bearing member 27, conventionally,
There is a structural problem in withstanding high stress such as a bonding portion between the rubber pressure plate 27a and the upper metal plate 27c due to high stress and local shear strain. In the embodiment of the present invention, in order to improve the problem of the adhesive force between the rubber supporting plate 27a and the upper metal plate 27c, and to restrain the shearing force of the adhesive interface in the outer peripheral direction due to the high stress, the elasticity is reduced. By forming the deformation allowable space (that is, the pot portion) 35, the rubber layer in the deformation allowable space reduces the shear force at the bonding interface against high stress, and a kind of bulk modulus (Eb = 200N / mm ²⁾ )
Is expressed. Therefore, the intermediate rubber layer has a single-layer structure except for the reinforcing upper metal plate 27c, thereby eliminating the concern of long durability of the adhesive force due to high stress.
Then, regarding the local shear strain of the rubber supporting plate 27a, a fillet portion is provided by R processing on the rubber expansion surface,
Dispersion of stress concentration due to local shear strain is achieved, and the shape is effective for long-term durability.

In the embodiment of the present invention, the upper and lower metal plates 27b and 27c at the upper and lower portions of the rubber supporting plate 27a are connected to the upper structure so as to eliminate excessive shear strain due to the shear deformation of the rubber supporting plate 27a. By disposing these members in an enclosing wall 25 provided on the base plate 22 so as not to be displaced by horizontal movement and expansion / contraction of the rubber member (that is, the rubber portion does not undergo shear deformation), the horizontal movement is restrained, The upper structure on the upper surface of the upper metal plate 27c is of a slide support type as described below.

The elastic bearing member 27 supports the load of the steel girder 19. In particular, the steel girder 19 is supported by the elastic bearing member 27 in a boltless manner. That is, an existing sole plate (or upper shoe) 29 made of a steel plate is bolted to the lower surface of the lower flange 30 of the steel girder 19 made of H-shaped steel.
Alternatively, a thin steel plate 33 is fixed to the lower surface of the lower surface by a fixing means such as a bolt 32 as necessary (the thin steel plate 32 need not be provided). As described above, the steel girder 19 and the elastic bearing member 27 receiving the load are not rigidly connected, and the existing sole plate 29 and the thin steel plate 33 are slidable on the upper surface of the upper metal plate 27c of the elastic bearing member 27. And a boltless support structure.

A cushioning member 34 is provided side by side with a predetermined distance from the load supporting elastic bearing member 27. That is, the cushioning member 34 is disposed between the lower structure 17 and the upper structure (in this case, a connecting steel girder connecting the parallel adjacent steel girders 19) 37, and mainly the steel girder 19 during an earthquake.
To absorb the horizontal and rotational vibrations that are applied to the surface. The specific structure of the buffering means 34 is not particularly limited as long as it is a buffering means using rubber, a spring, or the like, but the embodiment of the present invention shows an example using a rubber damper.

In the cushioning member 34, a mounting plate 38a fixed to the lower part of the connecting horizontal beam 37 with bolts 51 and the like, and a plurality of mounting plates 38a integrated with the mounting plate 38a and spaced apart in a substantially comb-tooth shape. Provided hanging support member 38b
Is provided. An anchor bolt 4 is provided on the upper part of the lower structure 17.
A plurality of upright support members 39 provided integrally with the mounting plate 39a fixed by 3 or the like and spaced apart in a substantially comb-tooth shape.
The lower support frame 39 consisting of b.
The hanging support member 38b and the upright support member 39b are engaged with each other from above and below, and a plurality of fixed gaps (a) are formed in the horizontal direction, and a certain gap (b) is formed in the vertical direction. It is provided as follows. Further, a block-shaped rubber damper 34a is provided as a specific example of the elastic body so as to fill the horizontal gap (a), and one side of the rubber damper 34a is fixed to the hanging support member 38b, and the other side is It is fixed to the upright support member 39b.

The rubber damper 34a is specifically shown in FIG.
As shown in FIG. 1, a rectangular body having a predetermined width W, a height H, and a length L is fixed on both side surfaces by attaching attachment plates 34b. Mounting plate 3
4b is an ear 3 projecting from a side edge of the rubber damper 34a.
4c, and a plurality of bolt insertion holes 40 are provided in the ear portion 34c.

A mounting plate 34b attached to one side of the rubber damper 34a is applied to a hanging support member 38b, and bolts 41 are inserted into bolt insertion holes 40 and 44 formed at both ends, and a fastening nut is inserted into a screw portion thereof. By screwing the 45, the plurality of rubber dampers 34a and the plurality of hanging support members 38b are respectively coupled. The mounting plate 34b attached to the other side of the rubber damper 34a is applied to the upright support member 39b, the bolt 41 is inserted into the bolt insertion holes 40 and 44 formed in both members, and the fastening nut 45 is inserted into the screw portion thereof. Are screwed together, the plurality of rubber dampers 34a and the plurality of upright support members 39b are respectively coupled.

The rubber damper 34a, the hanging support member 38b, and the upright support member 39b may be connected to each other by a bolt or nut, or by a rubber vulcanization integral molding. Alternatively, a bonding method using an adhesive can be used. In the case of rubber vulcanization integral molding, the hanging support member 38b and the upright support member 39b are interdigitated in a comb-tooth shape, and the raw rubber is disposed in the gap (a), and is heated and vulcanized to be integrally molded. Therefore, in this case, the mounting plate 34b is not used.

The first embodiment of the present invention has the above-mentioned configuration and operates as follows. The load of the upper structure such as a bridge such as a road bridge supported by the steel girder 19 is received by the rubber pressure plate 27a of the elastic bearing member 27, and the buffer member 34 is not loaded. When a large earthquake occurs, a downward force acting on the steel girder 19 is dispersed by compressing and deforming the rubber supporting plate 27 a in the surrounding supporting wall 25 for accommodating the elastic member via the deformation allowable space 35. Can be seismically isolated. With respect to the upper lift acting on the steel beam 19, the cushioning member 3 having the rubber damper 34a, the upper frame 38, and the lower frame 39
Since the steel girder 19 and the lower structure 17 are connected via 4, the upward deformation force is smoothly controlled by the shear deformation of the rubber damper 34 a.

In addition, against the horizontal force acting on the steel girder 19 due to the earthquake, that is, the force in the bridge axis direction and the direction perpendicular to the bridge axis, the sole plate 29 on the lower surface of the steel girder 19 becomes thin steel plate 33.
Top fourth upper metal plate 27c of the elastic support member 27 via the
The pressure contact support portion 42 is pressed against the fluorinated ethylene layer 28.
Are slidably joined to each other, so that the horizontal force is attenuated by sliding friction therebetween. In addition to this,
At the same time, the rubber damper 34a of the cushioning member 34 is attenuated by shear deformation in the bridge axis direction, and is attenuated in the direction perpendicular to the bridge axis by compression deformation of the rubber damper 34a.

Further, with respect to the rotational force acting on the steel girder 19 due to the earthquake, the compression deformation of the rubber supporting plate 27a of the load-bearing elastic bearing member 27 and the rubber damper 34 of the cushioning member 34 are performed.
a can be effectively attenuated by interaction with shear deformation.

FIGS. 12 to 15 show a bridge bearing device according to a second embodiment of the present invention. In the first embodiment of the present invention, the main girder of the bridge is steel girder 19, whereas in the second embodiment, the main girder of the bridge is constituted by box girder 46 made of PC concrete; The accompanying structure of mounting the bearing device 48 to the box girder 46 is different from that of the first embodiment of the present invention. The rubber damper 34a of the cushioning member 34 has both sides fixed to the hanging support member 38b and the upright support member 39b by integral vulcanization. Other configurations are the same as those of the first embodiment.

As shown in FIG. 12, on the upper surface of the lower structure 17, which is a pier, a buffer member 34 disposed at the center and load supporting members disposed at regular intervals on both sides in the direction perpendicular to the bridge axis. An elastic bearing member 27 is fixed, and two box girders 46 provided with a road 46c are installed in parallel on the upper surface of the upper slab 46a via these members 34 and 27.

The base plate 22 of the load supporting elastic bearing member 27 has a bolt insertion hole formed in the lower structure 17.
To the anchor member 24 fixed to the
4 is fixed to the lower structure 17 by fastening a nut 24a to the screw portion. In the upper metal plate 27c of the elastic bearing member 27, a mounting bolt 47 screwed to the sole plate 29 fixed thereto is inserted into a bolt insertion hole formed in the lower slab 46b of the box girder 46, and the upper surface of the lower slab 46b is By fastening a nut 47 a to the thread portion of the mounting bolt 47, the upper portion of the load supporting elastic bearing member 27 is connected to the box girder 46.

The lower frame 39 of the cushioning member 34
Is fixed to the lower structure 17 by fitting a bolt insertion hole formed in the mounting plate 39a to an anchor member 49 implanted in the lower structure 17 and fastening a nut 49a to a screw portion of the anchor member 49. I have. The upper frame 38 of the cushioning member 34 abuts on the lower flange portion 50a of a concrete (or steel) connecting member 50 having an arbitrary cross-sectional structure for connecting the left and right box girders 46, and is formed on the lower flange 50a. Mounting bolts 52 from the upper surface of the lower flange 50a through the bolt insertion holes of the upper frame 38.
The coupling member 50 and the cushioning member 34 are connected by fastening the connection member 50 to the screw hole 53.

Therefore, also in the second embodiment of the present invention, the load of the box girder 46 as the upper structure can be elastically supported by the load supporting elastic support member 27. Also, the horizontal force acting on the box girder 46 due to the earthquake, that is, the bridge axis direction,
Since the box girder 46 is slidably supported in the horizontal direction by the elastic bearing members 27 against the force in the direction perpendicular to the bridge axis, the box girder is dispersed and seismically isolated during an earthquake. In addition to this, at the same time, the rubber damper 34a
Is attenuated by shear deformation, and is also attenuated by compression deformation of the rubber damper 34a in the direction perpendicular to the bridge axis.

Further, with respect to the rotational force acting on the box girder 46 due to the earthquake, the compression deformation of the rubber supporting plate 27 a of the load supporting elastic bearing member 27 and the rubber damper 34 of the cushioning member 34
a can be effectively attenuated by interaction with shear deformation.

In the present invention, the enclosing bearing wall 25,
The structure of the reaction wall 26, the buffer member 34, and the like, and the fixing means may be appropriately changed in design. Also, the upper metal plate 27c of the load supporting elastic bearing member 27, the sole plate 29 (upper shoe) fixed to the steel girder 19 and the box girder 46, and the ethylene tetrafluoride layer 28 interposed therebetween are omitted. Alternatively, in addition to or in place of these, another member may be interposed (however, not shown). further,
The present invention can be used not only as a replacement bearing device for an existing steel bearing but also as a new bridge bearing device.

[0034]

The bridge bearing device of the present invention has the following excellent effects. a. With the existing sole plate attached to the upper structure, and using an ultra-thin and simple structure of elastic support members to support the load of the bridge, it can be processed within the thickness where the conventional support part was installed It is a structure that does not require any chipping of the structure. b. The load of the bridge can be elastically supported by using the elastic bearing member. c. Since the upper structure and the load-bearing elastic support member have a support structure capable of sliding friction, the horizontal swinging of the bridge in the bridge axis direction enables effective seismic isolation with a long period by the cushioning member. . d. As described above, since the upper structure and the load-bearing elastic bearing member are not rigidly connected but have a slidable joint structure,
Rolling of the upper structure in the direction of the bridge axis is not restricted by the elastic bearing member, and therefore, there is an effect that continuity of the bridge in the direction of the bridge axis can be achieved. e. In addition, since the upper structure is fixed to the base plate via the cushioning member, the bridge is effectively buffered against the omnidirectional forces, such as upward lift, horizontal force, and rotational force, which act due to the earthquake, and is connected. The bridge can be prevented by the no joint. f. In particular, there is a feature that the natural period of the adjacent bridge can be arbitrarily selected by using a buffer means (damper) which does not support the load. Further, due to the above-mentioned features, there is an effect that the space between the adjacent girders and the expansion joint can be reduced by about 40% as compared with the conventional seismic isolation distribution structure. g. When replacing the old and new bearing devices, the upper structure can be temporarily supported, and the new load-supporting elastic bearing member 27 and the cushioning member can be quickly mounted by a simple operation. h. Even when the bridge sways in the direction perpendicular to the bridge axis, it is possible to cushion the elastic member of the cushioning member by compressive deformation. i. Even when the upper structure such as a steel girder expands and contracts due to a temperature change, no load acts on the bearing device, and the temperature change can be smoothly handled. j. Since the bearing device has a simple structure, there is an effect that costs such as a product cost and a construction cost can be significantly reduced as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an installed state of a bridge support device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing a support state between a load supporting elastic bearing member and a steel girder.

FIG. 4 is a cross-sectional view showing a state where a steel girder is lifted from a load supporting elastic bearing member in FIG. 3;

FIG. 5 is a side view showing a connection state of a buffer member, a lower structure, and a steel girder.

FIG. 6 is a sectional view taken along the line BB of FIG. 5;

FIG. 7 is a sectional view of a base plate.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a plan view of a load supporting elastic bearing member.

FIG. 10 is a longitudinal sectional view of the load supporting elastic bearing member of FIG. 9;

11A, 11B, and 11C are a longitudinal sectional view, a side view, and a cross-sectional plan view of a rubber damper in a cushioning member.

FIG. 12 is a longitudinal sectional view showing an installation state of a bridge support device according to a second embodiment of the present invention.

FIG. 13 is an enlarged sectional view showing an installation state of a buffer member in FIG.

FIG. 14 is a sectional view taken along the line CC of FIG. 13;

FIG. 15 is a cutaway plan view of a bearing device according to a conventional example.

16 is a D over D sectional view of FIG. 15.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Locking protrusion 2 Steel bearing plate 3 Steel girder 4 Support structure 5 Steel pedestal 6 Rubber bearing 7 Supporting upper surface 8 Lateral pressure bearing protrusion 9 Steel bearing member 10 Steel holding member 11 Lateral pressure buffer Bearing elastic spacer 12 Press bearing surface 13 Upper bearing part 14 Mounting bolt 15 Play adjustment elastic bearing member 16 Lower flange 17 Lower structure 18 Bridge bearing device 19 Steel girder 20 Floor slab 21 Connecting beam 22 Base plate 23 Base 24 Anchor member Reference Signs List 25 encircling support wall 26 reaction wall 27 elastic support member for load support 28 ethylene tetrafluoride layer 29 sole plate (upper shoe) 30 lower flange 31 bolt 32 bolt 33 thin steel plate 34 buffer member 34a rubber damper 35 elastic deformation allowable space 36 Elastic deformation allowable space 37 Connecting cross beam 38 Upper support frame 38b Hanging support member 39 Lower support Holding frame 40 Bolt insertion hole 41 Bolt 42 Pressure contact support part 43 Anchor bolt 44 Bolt insertion hole 45 Fastening nut 46 Box girder 47 Mounting bolt 48 Supporting device 49 Anchor member 50 Connecting member 51 Bolt 52 Bolt 53 Screw hole

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ippei Nakamura 1-2-4 Nishishinsaibashi, Chuo-ku, Osaka City Sanei Building Inside the 1st Construction Department of Hanshin Expressway Public Corporation (72) Inventor Tetsuo Kochichi 1 Nishishinsaibashi, Chuo-ku, Osaka-shi -2-4 Sanei Building Hanshin Expressway Public Corporation First Construction Department (72) Inventor Eiji Agematsu 1-2-4 Nishishinsaibashi, Chuo-ku, Osaka City Sanei Building Hanshin Expressway Public Corporation First Construction Department (56) References 7-26514 (JP, A) JP-A 4-119808 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E01D 19/04 E01D 19/04 101

Claims (1)

(57) [Claims] 1. A bridge bearing device for supporting an upper structure to a lower structure via a load-bearing elastic bearing member, comprising:
A connection between the upper structure and the lower structure in a non-load-supporting manner.
Shock absorbing member that binds and absorbs omnidirectional vibration of the upper structure
And the upper structure is slidably supported in the horizontal direction.
The load-bearing elastic bearing members in a direction perpendicular to the bridge axis.
The cushioning member is provided at an interval,
A plurality of hanging support members of the upper support frame fixed to
Multiple uprights of lower support frame fixed to undercarriage
With the holding member with a gap in the horizontal direction.
In the horizontal gap, the vertical direction and the horizontal direction of the upper structure
Compression deformation due to omnidirectional vibration in the rotation direction
And the superstructure to prevent shear bridges due to shear deformation.
An elastic member for supporting the movable member;
The supporting member is fixed to the holding member and the upright supporting member,
The rubber pressure plate that constitutes the elastic support member is
Stored in the support wall provided on the fixed base plate,
An upper surface of an upper metal plate provided on the rubber supporting plate;
Friction sliding support surface with said superstructure with rating
And a supporting device for a bridge , wherein the supporting structure supports the upper structure .