JP2001003315A - Bridge bearing device equipped with approximately inverted t-shaped lift force stopping hook having interlock section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bridge bearing device equipped with approximately inverted T-shaped lift force stopping members having interlock sections capable of sufficiently corresponding to lift force of seismic force even if it is estimated at two-three times as strong as the conventional one. SOLUTION: A pair of hook interlocking pieces 4 equipped with hook interlocking inward projections 3 at an interval in the direction of a bridge axis are arranged to both sides at right angles to the bridge axis on the upper surface of a lower bearing member 2, the hook interlocking inward projections 3 are opposed to each other to arrange, the lower parts of the hook interlocking pieces 4 are fixed to the lower bearing member 2, and interlocking flanges 7 projected in the direction of the bridge axis are provided in both sides in the direction of the bridge axis of an inverted T-shaped interlocking hook body 6. Approximately inverted T-shaped lift force stopping members 12 having interlock sections projected toward an interlocking stage section 9 of an upper shoe in the direction at right angles to the bridge axis on the upper parts of them are arranged between the hook interlocking pieces 4 opposed to each other, and the interlocking flanges 7 of the inverted T-shaped lift force stopping members 12 are interloked with the lower surfaces of the hook interlocking inward projections 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a substantially inverted T-shaped upper lift stopping hook which supports an upper structure of a bridge or the like and has a locking portion for opposing the upper lift of the upper structure. The present invention relates to a bridge bearing device.

[0002]

2. Description of the Related Art In recent years, the revision of the specifications for road bridges has necessitated a response assuming that the upward lift of seismic force is 0.3 Rd, which is three times the conventional 0.1 Rd. In addition, it is necessary to design the bridge shaft and the horizontal force in the direction perpendicular to the bridge axis in consideration of the reaction force of two to three times, and accordingly, the side block (the side block provided on the lower support member side for stopping the horizontal force of the upper structure due to the seismic force) Bearing members provided on both sides in the direction perpendicular to the bridge axis)
And the weight of the superstructure also increases,
Since the uplift acting on the bearing device also increases, it is difficult to respond with the conventional L-shaped hook for the following reasons.
And even if it could be designed, it was uneconomical.

[0003] That is, as shown in Figs. 10 and 11, conventionally, as means for countering the lifting force of the upper steel shoe when seismic force acts, an upper surface of the lower support member 2 (lower steel shoe) is provided. A pair of steel holding members 46 extending in the bridge axis direction and projecting upward are integrally formed on the upper surface of the lower support member 2 (lower steel shoe) on both sides of the elastic bearing body 45 provided in the direction perpendicular to the bridge axis. And a vertical portion (base end) 48 of a steel L-shaped hook 47 fixed to the holding member 46 by a bolt 50 inserted into the bolt insertion hole. Are known. However, in the case of such a structure, the upper lift of the seismic force is less than the conventional 0.1.
Under the current situation where it is necessary to take a countermeasure assuming a reaction force of 0.3 Rd and three times as large as Rd, it has become difficult to adopt such a structure. The reason is that, as shown in FIG. 19, when the upward lift P1 increases three times, the steel L
Since the bending moment acting on the upper horizontal portion 49 of the V-shaped hook 47 increases, the thickness of the horizontal portion 49 increases in order to cope with this.
It is necessary to increase the thickness of the steel upper shoe 51, and therefore, there is a problem that the thickness of the steel upper shoe 51 increases. Further, when the horizontal force P2 in the direction perpendicular to the bridge axis increases three times as described above, the dimension (thickness) L2 of the steel holding member 46 in the direction perpendicular to the bridge axis increases, and the steel L-shaped hook 47 is formed.
There is a problem that the thickness H1 and the overhang dimension A of the lateral portion 49, that is, the overhang portion also become large. Therefore, when these considerations are taken into consideration, there is a problem that the size of the bridge bearing device is increased, the weight is increased, and the cost is increased. Thus, it is difficult to cope with the conventional L-shaped hook 47, and even if it can be designed, the design is uneconomical. The inventor has developed a substantially inverted T-shaped hook used in the present invention to solve such a problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed for the purpose of advantageously solving the above-mentioned problems, and can easily cope with a three-fold increase in the lift force due to an earthquake or the like. Also, the horizontal force in the direction perpendicular to the bridge axis and the horizontal force in the direction perpendicular to the bridge axis can easily cope with a design that anticipates a reaction force of 2 to 3 times, and the lower support member for stopping the horizontal force in the direction perpendicular to the bridge axis of the upper structure. Without making the side blocks (support members provided on both sides in the direction perpendicular to the bridge axis) relatively large,
Provided is a bridge bearing device having a substantially inverted T-shaped upper lift stopping hook having a locking portion which can be solved economically and with a simple structure even when the weight of a superstructure increases. With the goal.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a bearing device according to the present invention provides a support for a bridge disposed between a lower structure such as a pier or an abutment and an upper structure such as a bridge girder. In the bearing device, a pair of hooks having hook-locking inward projections spaced apart in the bridge axis direction on both sides in the direction perpendicular to the bridge axis on the upper surface of the lower support member fixed to the lower structure. A locking piece is arranged,
The hook locking inward projecting portions of the hook locking pieces are arranged so as to face each other, and the lower portions of the hook locking pieces are fixed to the lower support member. A locking portion that has a locking flange on both sides in the bridge axis direction of the substantially inverted T-shaped locking hook body, and protrudes toward the upper surface of the upper shoe fixed to the upper structure side. A substantially inverted T-shaped upper lift stopping hook having an upper portion is disposed, and a locking flange of the substantially inverted T-shaped upper lifting stop hook is engaged with a lower surface of the hook locking inwardly protruding portion.

Further, in the seismic isolation bearing device according to claim 2,
On both sides of the upper surface of the lower support member fixed to the lower structure in the direction perpendicular to the bridge axis, a pair of hook locking pieces each having a hook locking inward projection spaced apart in the bridge axis direction are provided. The hook engaging inward projections of the hook engaging pieces are arranged so as to face each other, and a lower portion of each hook engaging piece is fixed to the lower support member. A locking flange is provided between the stoppers so as to protrude in the bridge axis direction at lower portions on both sides in the bridge axis direction of the substantially inverted T-shaped locking hook body, and is fixed to the upper structure side. A substantially inverted T-shaped upper lift stopping hook having a locking portion projecting toward the upper surface of the upper shoe is fitted and arranged, and a substantially inverted T-shaped upper lifting force is provided on the lower surface of the hook locking inwardly projecting portion. The locking flange on the retaining hook is engaged and almost reversed Shaped on lift stop hook is fixed to the lower support member.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. First, components used to configure the elastic bearing device 30 according to the embodiment used in the present invention will be described. 9 to 11 show a lower support member (lower shoe) 2 made of steel. An upper end of an anchor rod or an anchor bolt 15 embedded and fixed in the lower structure 1 is provided on a lower surface of a base plate 32. It is fixed by welding or screw fixing. A pair of steel members having hook-locking inward protrusions 3 spaced apart in the bridge axis direction on both sides of the base plate 32 in the direction perpendicular to the bridge axis (left-right direction) above the lower support member 2. Of the hook locking support pieces 4 are arranged such that the hook locking inwardly protruding portions 3 of the hook locking support pieces 4 face each other. The lower portion is fixed to the base plate 32 of the lower support member 2, and the pair of hook locking pieces 4 form a hook locking and holding member 5, which is shown in FIGS. To
A locking flange 7 is provided at the lower part on both sides in the bridge axis direction of the substantially inverted T-shaped locking hook body 6 so as to protrude integrally therewith in the bridge axis direction. The locking flange 7 of the substantially inverted T-shaped upper lifting stopper 12 having a locking portion 11 protruding so as to contact or approach the upper surface 10 of the locking step 9 of the upper shoe 8 is engaged. Has been stopped.

A front shear deformation constraining wall 13 and a rear shear deformation constraining wall 14 are disposed on both sides of the upper surface of the base plate 32 in the bridge axis direction (front-rear direction) at intervals. 13 and the inner wall surface 15 having an arc-shaped cross section in the rear shear deformation restraining wall 14
Are arranged so as to face each other, and the lower portions of the respective shear deformation constraint walls 13 and 14 are fixed to the base plate 32 by welding or the like. The front shear deformation restraint wall 13 and the rear shear deformation restraint wall 14 constitute a shear deformation restraint wall 25.

FIGS. 16 and 17 show a substantially inverted T-shaped upper lift stopping hook 12 made of steel used in the present invention. The locking flange 7 is integrally provided at the lower part on both sides in the bridge axis direction so as to protrude in the bridge axis direction, and protrudes from the upper part of the locking hook body 6 in a cantilever manner in the direction perpendicular to the bridge axis. A locking portion 11 composed of a locking flange is provided integrally. The locking portion 11 is in contact with a narrow steel sole plate 39 attached to a lower portion of the upper structure 38 in a direction perpendicular to the bridge axis and a lower surface thereof.
9 is provided so that the direction perpendicular to the bridge axis is in contact with or close to the upper portion (upper surface 10) of the locking step 9 formed by the upper portions (upper surface 10) on both sides of the upper shoe 8 having a wider width. (See FIG. 5). Further, a plurality of female screw lateral holes 23 are provided at intervals in the direction of the bridge axis on the outer side in the vertical direction of the bridge axis at the middle part of the locking hook body 6 in the vertical direction.

FIGS. 18 (a) and 18 (b) show a steel mounting bracket 22 for mounting the upper lift stopping hook 12 of the generally inverted T-shape used in the present invention to the lower supporting member 2. FIG. The vertical plate portion 22a of L-shaped cross section made of unequal angle iron is provided with horizontal holes 17 for bolt insertion at intervals in the bridge axis direction, and the horizontal plate portion 22b is spaced apart in the bridge axis direction. In addition, a bolt insertion vertical hole 18 is provided. Bolts 19 inserted into the bolt insertion horizontal holes 18
Is screwed into a female screw hole 20 in the locking hook body 6, and a bolt 19 inserted into the bolt insertion vertical hole 18 is provided in the lower support member 2.
1, the substantially inverted T-shaped upper lifting stopper 12 is fixed to the lower support member 2.

FIG. 12 and FIG. 13 show an elastic bearing body 31 which is disposed so as to approach or come into contact with each inner wall surface 26 having an arc-shaped cross section inside the shear deformation restraining wall 25. A lower steel member 27 comprising a circular lower fitting support member, an upper steel member 28 comprising a planar circular upper fitting support member having substantially the same shape as the lower steel member 27, and each of the steel members 2
And an elastic body (layer) 29 which is interposed between the members 7 and 28 and is integrally fixed thereto by an adhesive material, baking or integral molding. The elastic bearing body 31 is provided inside the shear deformation restraining wall 25. The lower and upper steel members 27 and 28 are restrained from moving relative to each other by being fitted and arranged so as to approach or contact each inner wall surface 26 having an arc-shaped cross section. The shear deformation of the elastic body (layer) 29 due to the relative lateral displacement of the upper and lower ends of the elastic body (layer) 29 such as rubber at 31 is indirectly restricted. Therefore, the elastic bearing body 31
However, the upper steel member 28 is prevented from laterally moving in the direction perpendicular to the bridge axis and in the bridge axis direction, etc., and the upper steel member 28 with respect to the shear deformation restraining wall 25 has a smaller compressive force due to the load of the upper structure or the like from above. It is provided so as to be slidable in the vertical direction due to the change. The cross-sectional shape of each cross-sectionally arc-shaped inner wall surface 26 of the shear deformation constraining wall 25 is arranged on the same circular locus at the center, and is substantially the same as the circular arc of a flat circular shape of the outer peripheral portion of the upper steel member 28. The shapes are set to be the same or similar, and are formed in an arc shape. The shear deformation restraint wall 2
On the inner wall surface 26 of 5, a low-friction sliding bearing surface 33 made of a Teflon layer, an ethylene tetrafluoride plate or a layer is formed. Reference numeral 34 denotes a space for allowing deformation of the elastic body (layer) 21.

The elastic bearing 31 is shown in FIGS.
As shown in FIG. 3, a lower steel member 27 formed of a lower fitting support member having an upward opening groove 27a having a substantially inverted trapezoidal cross section on the upper surface, and an upper fitting support member having a downward opening groove 28a having a substantially trapezoidal cross section on the lower surface. And an elastic layer (body) 29 made of rubber or the like integrally joined to these grooves by an adhesive or an integral molding or the like. A circular fitting recess 35 is provided on the upper surface of the upper steel member 28, and a slip bearing member 36 such as an ethylene tetrafluoride plate or an ethylene tetrafluoride layer fits into the fitting recess 35. It is stopped and fixed by an adhesive or the like, or a slide bearing member 36 such as a stainless steel plate is fixed to the upper surface of the upper steel member 28 by a screw or the like. By forming the annular concave portion 41 on the outer peripheral surface of the elastic layer (body) 29 by R processing or the like, concentration of stress on the outer peripheral edge of the rubber layer or the like is reduced.

An uneven adhesive surface 37 is formed on the entire upper surface of the lower steel member 27 and the lower surface of the upper steel member 28 of the elastic bearing member 31 by an annular corrugated roll or knurling process. Steel member 2
The adhesive interface between the elastic layer 29 and the elastic layer 29 is formed as an uneven adhesive surface 37 formed by an annular corrugation or a knurling process, so that the elastic layer 29 is more compressed and deformed than a flat adhesive surface. Separation due to shearing force applied to the bonding surface between the elastic layer 29 and the steel members 27 and 28 can be more effectively prevented.

The middle part of the outer side surface of the upper steel member 28 in the vertical direction (substantially the center part in the drawing) is brought into close proximity to or in contact with the inner upper part of the steel shear restraint wall 25. The upper surface level of the steel shear restraint wall 25 is set so as to be located at an intermediate portion of the plate thickness of the upper steel member 28 (in the illustrated case, substantially at the level of the central portion of the plate thickness). .

As described above, if the slip bearing member 36 such as a non-metallic Teflon (registered trademark) layer is provided, a gap is provided between the inner surface of the shear restraint wall 25 and the outer circumferential surface of the upper steel member 28. Even if the upper steel member 28 is slightly tilted (rotated) due to the bending of the upper structure, the upper steel member 28 can be supported while absorbing this.

The thickness of the upper steel member 28 is set to be equal to the thickness of the steel shear restraint wall 25 while supporting the load of the upper structure.
Of the upper steel member 28 may be located at a level substantially at the center of the thickness of the upper steel member 28. If the peripheral portion of the upper steel member 28 is formed into an arc portion, that is, an arc-shaped outer surface portion in consideration of the rotation due to the bending of the upper structure (main girder) 38, the bending (rotation) of the upper structure (main girder) 38 occurs. Again,
The upper steel member 27 can be slid smoothly.

In the case of the above embodiment, the elastic support 31 is indirectly locked to the lower structure 1 via the lower support member 2 and moves directly in the horizontal direction to the steel shear restraint wall 25. The elastic body (layer) 29 of the elastic support body 31 is locked so as not to be deformed by shearing. On the lower surface of the upper shoe 51 which is fixed to the upper structure 38 side via the sole plate 39, a sliding support member 40 such as an ethylene tetrafluoride plate or an ethylene tetrafluoride layer or a stainless steel plate is fixed. The structure 38 is supported on the elastic support 31 via a sole plate 39 and an upper shoe 51. In the case of this embodiment, since the rubber layer is not subjected to shear deformation as described above,
The rubber layer can act as an elastic bearing 31 having a relatively high bearing stress, and thus the elastic bearing 31 constitutes an elastic bearing for a high bearing load.

The elastic bearing 31 for a high bearing load has
An annular concave portion 41 having a substantially semicircular shape is formed on the outer peripheral surface of the intermediate portion of the elastic layer 29 such as a thin rubber by R processing.
A hard plate 42 such as a reinforced steel plate is embedded in the elastic layer 29. Note that a circular hole may be provided in the center of the hard plate 42 as illustrated. An upper steel support member (upper fitting support member) 28 and an upper steel support member (lower fitting support member) having a cup-shaped cross section having annular reaction walls 28b and 27b at the upper and lower portions of the elastic layer 29, respectively. 27 are fitted. The contact portion between the inner surfaces of the upper and lower fitting support members 28 and 27 and the upper and lower surfaces of the elastic layer 29 is an adhesive surface 43,
The upper and lower portions of the elastic layer 29 are fitted inside the reaction walls 27b and 28b (pot portions). The whole circular surface of the lower surface of the upper fitting support member 28 and the upper surface of the lower fitting support member 27 and the hard plate 4 of the elastic bearing body 31 for high bearing pressure.
2, an uneven adhesive surface 37 is formed on both front and back surfaces by an annular corrugated roll or a knurling process.
The bonding interface between the upper fitting support member 28, the lower fitting support member 27, and the elastic layer 29 of the hard plate 42 is formed by an uneven bonding surface 37 formed by an annular corrugation or knurling.
As a result, as compared with the flat bonding surface, the shear force applied to the bonding surface between the elastic layer 29 and the upper and lower steel members 28 and 27 when the elastic layer 29 is compressed and deformed. Peeling can be more effectively prevented. In the embodiment shown in the drawings, a through hole is provided in the center of the hard plate 42 made of a reinforcing steel plate, and the upper and lower rubber layers of the hard plate 42 are integrated.

In the elastic bearing 31 for high bearing pressure, for example, 200 kg of an arrow P (shown in FIG. 13) from above.
/ When cm ² to a high load, such as that 250 kg / cm ² is applied, the elastic layer 29, the arrow P ₁ the direction of shear force acts, the shearing force is an elastic layer 29 and the upper and lower fitted and the supporting member 28, 27, ie upper steel member 28 and lower steel member 2
7 acts as a peeling force on the bonding surface 43 with the elastic layer 29, but the reaction force walls 27 b and 28 b mechanically restrain the shearing force acting on the bonding surface 43 in the elastic layer 29, and
The upper fitting support member 28, the lower fitting support member 27, and the hard plate 42 are configured so as not to apply a shear force to the upper and lower portions and to reduce the concentration of stress on a part of the elastic layer. Since the adhesive interface with the elastic layer 29 is formed as an uneven adhesive surface 37 formed by an annular corrugation or knurling, the structure has a structure that can sufficiently withstand a high bearing pressure.

Further, in addition to the reaction walls 28b and 27b of the upper and lower fitting support members 28 and 27, the presence of the annular concave portion 41 formed by the R processing on the outer peripheral surface of the intermediate portion of the elastic layer 29 causes a vertical high bearing pressure. Since the elastic layer 29 is compressed and deformed to such an extent that the annular concave portion 41 is eliminated or the outer layer slightly swells so as not to substantially affect the supporting action of the elastic layer 29, the elastic layer 29 is partially formed of the rubber layer. The concentration of stress can be reduced, and the force acting to separate the adhesive surface 37 between the upper and lower portions of the elastic layer 29 and the upper and lower fitting support members 28 and 27 does not exist in the annular recess 41. Therefore, the elastic bearing 31 for a high bearing load has a structure that can smoothly cope with a high bearing pressure.

When a steel supporting member made of a flat steel plate without the reaction walls 28b and 27b is used, a flat bonding interface is formed, so that the shearing force and the peeling force acting on the bonding interface are reduced. increases, in which case the bearing capacity stress is a limit of about 120 kg / cm ^2, for example, Bearing stress can not be Bearing a high load of to 200 Kg / cm ² no 250 Kg / cm ^2, above As described above, the elastic bearing device used in the embodiment does not have such a problem.

More specifically, as shown in FIG. 4, the elastic bearing device 3 having the high bearing elastic bearing body 31 as one of the main elements.
At 0, the upper and lower fitting support members 28 and 27 of the elastic bearing 31 for high bearing are adjacent to the shear deformation restricting wall 25, and the elastic layer 2 of the elastic bearing 31 for high bearing is provided.
The upper surface 28c of the upper fitting support member 28 fitted on the upper part of 9
The height H of the top surface 25d of the shear deformation restraining wall 25 than the height H ₄ is provided at a position below the. Therefore, the upper plate 28c of the upper fitting support member 28 of the elastic bearing 31 for high supporting pressure, which is located at a position higher than the top surface 25d of the shear restraint wall 25, is attached to the sole plate 39 attached to the lower surface of the upper structure.
(In the case shown, the upper surface of the slide bearing member 36) can be slidably and elastically supported.

In addition, as described above, the upper fitting support member 2
8 is lower than the top surface 25b of the shear restraint wall 25, so that the elastic layer 29 and the upper fitting support member 28 of the elastic bearing member 31 for high bearing pressure are restrained by the shear deformation restraint wall 25. Supported. Furthermore, the upper shoe 51 attached to the upper structure via the sole plate 39,
As described above, since the upper bearing 28 is slidably supported on the upper surface 28c of the upper support member 28 of the elastic bearing 31 for high bearing, the elastic layer 29 of the elastic bearing 31 for high bearing is not subjected to shear deformation. It is a so-called forced slide type support. In the case shown in the figure, the upper shoe 51
Is supported so as not to slide in the direction perpendicular to the bridge axis, is slidable only in the bridge axis direction, and is limited in movement in the bridge axis direction except for a predetermined length by the hook retaining piece 4.

FIGS. 14 and 15 show a steel upper shoe 51 used in the present invention. A lower portion of a shear key 57 is fitted to the center of the upper surface of the upper shoe body made of a steel plate. And a plurality of female screw holes 51a are provided on the outside of the circular recess 54 in the direction perpendicular to the bridge axis at intervals in the bridge axis direction. Further, stoppers 58 protruding in a direction perpendicular to the bridge axis are provided integrally with the upper shoe body on both front and rear sides in the bridge axis direction.
A slide bearing 61 made of a stainless steel plate or the like described below is fixed to the lower surface of the upper shoe body. The hook locking pieces 4 are arranged so as to face each other with a gap between the bridge axis direction stoppers 58, and the upper shoe 51 is relatively movable in the bridge axis direction within the gap. The movement beyond the interval is restricted as described above.

FIGS. 1 to 4 show a state of use of an elastic bearing device 30 according to an embodiment of the present invention. The elastic bearing device 30 includes an upper structure 38 such as a bridge girder and a pier or an abutment. Are arranged between the lower structures 1.
An elastic bearing device 30 is arranged on the upper surface of the lower structure 1 such as a bridge pier, and the lower portion thereof is fixed, and a circular hole is formed in the lower surface of the upper structure 38 such as a steel main girder 52 such as an H-shaped steel. 53
The upper surface of the upper shoe 51 having the circular concave portion 54 at the center upper surface is formed on the lower surface of the steel sole plate 39 by abutting and fixing the upper surface of the steel sole plate 39 made of a steel plate having A cylindrical shear key 57 is fitted in contact with the circular hole 53 and the circular concave portion 54, and a bolt insertion through hole 55 a provided in the lower flange 55 of the steel main girder, and a steel sole plate The fixing bolt 5 which is inserted through the bolt insertion hole 39a provided in the screw 39 and is screwed into the female screw hole 51a of the steel upper shoe 51.
6, the steel upper shoe 51 is attached to the lower surface of the steel main girder 52. On the lower surface of the steel upper shoe 51,
A sliding support member 61 such as a tetrafluoroethylene plate or layer or a stainless plate is fixed with an adhesive or a screw. A steel upper shoe 5 attached to the lower end of a main girder 47 made of steel or the like extending in the bridge axis direction above the elastic bearing device 30.
The lower surface of 1 is slidably mounted in the bridge axis direction.

The dimension of the steel sole plate 39 in the direction perpendicular to the bridge axis (width direction) is smaller than the dimension of the steel upper shoe 51 in the middle part in the direction of the bridge axis (direction perpendicular to the bridge axis). Is set. That is, a projecting portion 59 is formed in which the edge of the steel upper shoe 51 in the direction perpendicular to the bridge axis is more protruded than the edge of the steel sole plate 39 in the direction perpendicular to the bridge axis, and on the upper surface 60 of the projecting portion 59. The locking portion 11 of the substantially inverted T-shaped upper lifting stopper 12 is engaged. The locking step 9 is formed by the side surfaces on both sides of the steel sole plate 39 in the direction perpendicular to the bridge axis and the upper surface 60 of the overhanging portion 59 of the steel upper shoe 51 whose edge in the direction perpendicular to the bridge axis is further extended. (See FIG. 5).

The integrated bridge elastic bearing device 30 operates as follows. The load of the upper structure 38 such as a road bridge supported by a main girder 52 such as a concrete girder or a steel girder is received by the elastic bearing device 30. When a large earthquake occurs, a downward force acting on the main girder 52 can be reduced and dispersed by compressive deformation of the rubber in the shear restraint wall 25. For the upper lift acting on the main girder 52, the steel upper shoe 5
1, an upper structure 38 such as a main girder 52 and a lower structure via a lower support member 2 provided with a substantially inverted T-shaped upper lift stopping hook 12 having a locking portion 11 and a hook locking supporting piece 4. 1
Are mechanically connected to each other, so that they can be firmly supported.

The horizontal force acting on the upper structure 38 such as the concrete main girder 52 due to the earthquake, that is, the force in the bridge axis direction, is not affected by the stainless steel plate attached to the lower surface of the upper shoe 51 of the main girder 52. The sliding support member 61 is pressed against the sliding supporting member 36 of the upper fitting supporting member 28 of the elastic supporting body 31, and the press-contact supporting portion is slidably joined in the bridge axis direction. The horizontal force is attenuated by the sliding friction. Further, a force in a direction intersecting with the bridge axis such as a direction perpendicular to the bridge axis is supported and restrained by the hook locking and holding member 5.

Therefore, against the seismic force acting on the upper structure 38 such as the main girder 52 due to the earthquake, the sliding bearing action by the frictional force by the elastic bearing device 30 slidable in the bridge axis direction and the high bearing elastic bearing. Interaction with the compressive deformation of the elastic layer 29 of the body 31 can effectively attenuate. Further, the hook locking and holding member 5 can firmly support a force in a direction intersecting with the bridge axis such as a direction perpendicular to the bridge axis.

In the case of the high bearing elastic bearing body 31 of the above embodiment, an annular concave portion 41 is formed on the outer peripheral surface of the elastic layer 29 such as a rubber layer by an R process or the like, so that the rubber layer is further formed. The concentration of stress on the outer peripheral edge and the like is reduced, and therefore, when this rubber layer is subjected to a high load from above and is compressed and deformed, the outer surface of the rubber layer as a whole becomes substantially the same,
Thereby, the peeling action is less exerted on the adhesive surfaces with the upper and lower fitting support members 28 and 27, the compression deformation can be performed smoothly, and the bending (rotation) and vibration of the main girder 52 can be absorbed.
In addition, since the rubber layer is embedded with at least one hard plate 42 such as a reinforcing steel plate, even if the bearing pressure is high,
By distributing the internal stress of the rubber layer widely, excessive local distortion of the rubber layer can be suppressed. In the high bearing elastic bearing 31 used in the present invention, the steel members 27 and 28 in contact with the rubber layer 29 or the hard plate 42 such as a reinforcing steel plate or the upper fitting support member 28 and the lower fitting support member 27 are used. In order to enlarge the bonding surface and increase the shear resistance of the rubber layer by roughening the bonding interface with the rubber layer in Increases force and peel resistance.

In the embodiment of the present invention, when the rubber layer is thin, the hard plate 42 does not have to be embedded. However, when the rubber layer is thin, a hard steel plate or the like embedded in the rubber layer (or elastic layer) 29 may be used. As the plate 42, at least one or more steel plates having a thickness of 1 mm or more may be embedded, and a plurality of sheets may be embedded as needed. In addition, in the case of the above embodiment, it can be used for high bearing pressure. However, when used for higher bearing pressure, the thickness of a hard plate such as a reinforcing steel plate embedded in the rubber layer (or elastic layer) 29 is reduced. For example, 1 to 100 mm or the like may be appropriately selected, and a plurality of sheets may be embedded and used as needed. By forming an uneven adhesive surface 37 by annular corrugation or knurling on the front and back surfaces of a hard plate 42 such as a reinforced steel plate, the integrated area can be further increased by increasing the adhesive area, and the peel resistance and shearing force can be increased. Deformation resistance can be increased.

In the case of the bearing device of the above embodiment, the structure is relatively simple, so that it can be manufactured at low cost and can be provided at low cost. Since the fatigue caused by the repetition of relatively large shear deformation caused by the displacement in the direction does not occur, the durability of the elastic body can be increased, and the load bearing and the rotation bearing action of the elastic bearing device are functioning while the main girder is being used. Can be slidably supported in the direction of the bridge axis at all times, so even if seismic force acts during construction, as well as after the construction of the upper structure, excessive support in the bridge axis direction will be applied to the elastic bearing device. The superstructure can be supported without exerting force. In addition, since the front and rear shear deformation restraining walls are open on both sides in the direction perpendicular to the bridge axis, impurities such as rainwater and dust do not accumulate in the shear deformation restraining walls, thereby exhibiting the elasticity of rubber. In the case where there is no danger of being unable to be performed, and when cleaning or the like is required, the maintenance is easy, the structure is simple and the size is relatively small, so that an economical elastic bearing device for supporting loads is provided. In addition, since the elastic bearing device does not cause shear deformation, the design is simplified, and the required compression spring constant can be arbitrarily set.

In the above-described embodiment, the upper lift stopping hook 12 having a substantially inverted T-shape having a locking portion is connected to the lower supporting member 2.
However, when the present invention is implemented, the upper lifting force stopping hook 12 may be fixed to the hook engaging piece 4. In this case, an L-shaped steel member may be used, or a plate member made of a steel plate may be used, and a plurality of bolt insertion through holes may be provided at an intermediate portion in a longitudinal direction of the plate member, And also provided with a plurality of bolt insertion through-holes at both ends in the longitudinal direction of the plate-shaped member, and through the bolt insertion through-hole provided in the middle portion of the plate-shaped member in the longitudinal direction,
While screwing and fixing to the female screw hole for bolt screwing provided in the 12 intermediate part of the upper lifting force stopping hook, while inserting the fixing bolt into each bolt insertion through hole provided at both ends in the longitudinal direction of the plate-like member, A female screw hole for bolt engagement may be provided in the hook engaging piece, and the bolt may be fixed to the female screw hole.

In the illustrated embodiment, the embodiment has been described in which the present invention is applied to an elastic bearing device having an elastic bearing body such as a rubber layer. However, the present invention may be applied to a steel bearing device other than the elastic bearing.

[0035]

As described above, according to the present invention, the bridge supporting apparatus having the substantially inverted T-shaped upper lift stopping hook 12 having the locking portion 11 is provided on the lower supporting member 2 side. Even if the thickness of the hook locking piece 4 in the direction perpendicular to the bridge axis is increased, the lateral portion of the steel L-shaped hook, that is, the overhang dimension A is not increased as in the prior art, that is, the upper lift stopping hook 12 The lifting portion of the hook 1
The projecting distance of the locking portion 11 from the base end of the second member is significantly shorter than the projecting distance of the conventional steel L-shaped member, so that the bending moment is significantly reduced, and therefore a larger bending moment is borne. can do. Also, without increasing the upper lifting force retaining hook relatively large, and without increasing a large bending moment, as in the case of using a conventional form at the tip of the upper lifting force retaining hook, against an increase in the upper lifting force, By using a simple structure and a relatively simple upper lift stopping hook, the upper structure can be firmly supported against the upper lift in the event of an earthquake. Further, the substantially inverted T-shaped upper lift stopping hook used in the present invention has a dimension of the hook locking holding piece in the direction perpendicular to the bridge axis even when the horizontal force of the upper structure in the direction perpendicular to the bridge axis is increased. Even if the (wall thickness) increases, it is not affected by this.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a bridge elastic bearing device according to an embodiment of the present invention is used.

FIG. 2 is a side view of FIG.

FIG. 3 is a partial vertical front view of FIG. 1;

FIG. 4 is a partial side view of FIG. 2;

FIG. 5 is a perspective view showing the vicinity of an upper lifting force stopping hook, an upper shoe, and hook engaging pieces.

FIG. 6 is a front view showing the elastic bearing device.

FIG. 7 is a partially longitudinal side view showing the elastic bearing device.

FIG. 8 is a plan view showing an elastic bearing body.

FIG. 9 is a partially longitudinal front view showing a lower support member.

FIG. 10 is a partially longitudinal side view showing a lower support member.

FIG. 11 is a plan view showing a lower support member.

FIG. 12 is a plan view showing an elastic bearing body.

FIG. 13 is a partial longitudinal front view showing an elastic bearing body.

FIG. 14 is a plan view of the upper shoe.

FIG. 15 is a sectional view taken along line AA of FIG. 14;

FIG. 16 is a front view showing an upper lift stopping hook.

FIG. 17 is a side view showing the upper lift stopping hook.

18A is a side view of a mounting hardware, and FIG. 18B is a front view of the mounting hardware.

FIG. 19 is a longitudinal sectional front view showing, on an enlarged scale, a part of a conventional elastic bearing device using an L-shaped hook.

FIG. 20 is a side view of FIG. 19;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower structure 2 Lower support member 3 Inward protrusion for hook locking 4 Hook locking support piece 5 Hook locking holding member 6 Reverse T-shaped locking hook main body 7 Locking flange 8 Upper shoe 9 Locking step Part 10 Top surface 11 Engagement part 12 Inverted T-shaped upper lift stopping hook 13 Front shear deformation restraint wall 14 Rear shear deformation restraint wall 15 Anchor rod or anchor bolt 16 Shear deformation restraint wall 17 Bolt insertion lateral hole 18 Bolt insertion Vertical hole 19 Bolt 20 Female screw hole 21 Female screw hole 22 Mounting hardware 22a Vertical plate portion 22b Horizontal plate portion 23 Female screw hole 25 Shear deformation restraint wall 26 Cross-section circular inner wall surface 27 Lower steel member (lower fitting support member) 27a Upward Opening groove 27b Annular reaction wall 28 Upper steel support member (upper fitting support member) 28a Downward opening groove 28b Annular reaction wall 29 Elastic layer 0 Elastic bearing device 31 Elastic bearing body 32 Base plate 33 Sliding bearing surface 34 Space 35 Fitting concave part 36 Sliding bearing member 37 Uneven adhesive surface 38 Upper structure 39 Sole plate 39a Bolt insertion vertical hole 40 Sliding bearing member 41 Annular concave part 42 Hard plate 43 Adhesive surface 45 Elastic bearing 46 Steel holding member 47 Steel L-shaped hook 48 Vertical part 49 Side part 50 Bolt 51 Upper shoe 52 Main girder 53 Circular hole 54 Circular recess 55 Lower flange 55a Bolt insertion vertical Hole 56 Fixing bolt 57 Shear key 58 Stopper 59 Overhanging part 60 Upper surface 61 Sliding bearing material

Claims (2)

[Claims] 1. A bridge bearing device disposed between a lower structure such as a pier or an abutment and an upper structure such as a bridge girder in a direction perpendicular to a bridge axis on an upper surface of a lower support member fixed to the lower structure. A pair of hook locking pieces each having a hook locking inward projection are arranged at both sides of the hook locking piece at an interval in the bridge axis direction, and the hook locking pieces in the hook locking pieces are inwardly directed at the respective hook locking pieces. The protrusions are arranged so as to face each other, the lower portions of the hook locking pieces are fixed to the lower support member, and a substantially inverted T-shaped locking hook body is provided between the facing hook locking pieces. A substantially inverted T-shaped upper lift stopping hook having locking flanges on both sides in the bridge axis direction and having a locking portion projecting upward from the upper surface of the upper shoe fixed to the upper structure side. The hook is inwardly projected for locking. A support for a bridge having a substantially inverted T-shaped upper lift stopping hook having a locking portion, wherein a locking flange of the substantially inverted T-shaped upper lifting stopper is engaged with a lower surface of the portion. apparatus. 2. A pair of inwardly projecting projections for hook locking, which are spaced from each other in the direction of the bridge axis on both sides in the direction perpendicular to the bridge axis on the upper surface of the lower support member fixed to the lower structure. Hook locking pieces are arranged, and the hook locking inward protruding portions of the hook locking pieces are arranged so as to face each other, and a lower portion of each hook locking piece is fixed to the lower support member, A locking flange is provided between the opposed hook locking pieces so as to protrude in the bridge axis direction at lower portions on both sides in the bridge axis direction of the substantially inverted T-shaped locking hook body, and the upper structure A substantially inverted T-shaped upper lift stopping hook having a locking portion projecting toward the upper surface of the upper shoe fixed to the side is fitted and arranged, and is substantially opposite to the lower surface of the hook locking inwardly projecting portion. Engagement of the locking flange on the T-shaped lifting lift hook A bridge support device having a substantially inverted T-shaped upper lift stopping hook having a locking portion, wherein the substantially inverted T-shaped upper lifting stopper is fixed to the lower support member.