JPH10280320A - Rubberlike elastic bearing method and device for bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic bearing method and device for a bridge in which a rubberlike elastic bearing member functions as a sliding support during erection of the bridge and brings out the same effect with the preliminary shearing deformation after installation and stably keeps the upper structure even against vertical vibration. SOLUTION: A plurality of intermediate steel plates 5 and unvulcanized rubber sheets are laminated between the upper shoe 2 supported at the underface of the upper structure 1 of a concrete bridge girder or the like and the lower shoe 4 supported by the lower support structure 3 and integrally formed to obtain a rubberlike elastic bearing body 7 for a bridge. A slide plate 9 is integrally fitted onto the upper face of the rubberlike elastic bearing body 7 through a shearing key 8a between the upper shoe 2 and the ruberlike elastic bearing body 7 and a low friction member 10 such as a stainless plate 10a, polytetrafluoroethylene(PEFE) 10b, etc., is set at the slide face between the slide plate 9 and the upper shoe 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber elastic support method for a bridge and a rubber elastic support device for the bridge, and more particularly to an upper structure such as a concrete bridge girder and a lower support structure such as an abutment or a pier. The rubber-like elastic bearings that are interposed between the bearings function as sliding bearings during the construction of the bridge, and after the completion of the construction, an effect equivalent to the preliminary shearing deformation can be obtained. The present invention relates to a rubber-like elastic bearing method for a bridge and a rubber-like elastic bearing device for the bridge.

[0002]

2. Description of the Related Art Conventionally, a rubber-like elastic bearing member is installed between an upper structure such as a concrete bridge girder and a lower support structure such as an abutment or a pier, and vibration energy from the upper structure and
It is configured to absorb and alleviate rolling and expansion and contraction of the upper structure. However, the rubber-like elastic bearing moves horizontally in the longitudinal direction of the structure due to expansion and contraction due to temperature change of the upper structure, drying shrinkage and creep of the concrete structure, and shear deformation is applied to the rubber-like elastic bearing. Conventionally, a rubber-like elastic bearing is preliminarily subjected to a pre-shearing deformation of an amount equivalent to the amount of deformation such as drying shrinkage and creep of a concrete structure in a direction of deformation of an upper structure. Is known to be given in the opposite direction.

[0003]

In a conventional rubber-like elastic bearing device for a bridge, when a superstructure such as a concrete bridge girder is constructed, a rubber-like elastic bearing body is provided with a rubber layer in the rubber bearing. There has been proposed a pre-slide type bridge girder support device which is slid and installed while preventing shear deformation of the bridge girder (JP-A-7-238509).

The upper shoe supported on the upper structure of the pre-sliding type bridge girder support device absorbs sliding shrinkage and creep of the bridge girder during construction of a concrete bridge by sliding, and shears the rubber layer therebetween. This is a bearing that prevents deformation and locks the slide mechanism when the bridge girder is completed, and functions elastically as a dispersion or seismic isolation bearing. However, the pre-slide type bridge girder support device has a problem that it can absorb only the shrinkage of the bridge girder from the start of the construction to the completion of the construction, and the subsequent shrinkage of the bridge girder can only be obtained by the shear deformation of the rubber-like elastic bearing body. In addition, there is a problem that much labor and time are required during construction.

Further, the conventional rubber-like elastic bearing device for a bridge is held by side blocks provided on both sides of the rubber-like elastic bearing body in a direction orthogonal to the bridge axis direction against a certain limit of horizontal swing. By doing so, it is possible to prevent the upper structure from falling, etc., but it is not possible to hold against vertical vibration, and in the worst case, the upper structure is installed on a lower support structure such as a pier There is a problem that it falls off from the rubber-like elastic bearing body.

The present invention has been devised in view of such a conventional problem, and a rubber-like elastic bearing member functions as a sliding bearing during the construction of a bridge, and is equivalent to a preliminary shearing deformation after the completion of the construction. A rubber-like elastic bearing method for bridges that can obtain the effect, safely holds the upper structure against horizontal shaking and vertical vibration, and can be easily installed at the time of construction and improves workability. It is an object of the present invention to provide a rubber-like elastic bearing device for a bridge.

[0007]

According to the present invention, in order to achieve the above object, a slide plate slidable in the direction of a bridge axis is integrally formed between a rubber-like elastic bearing and an upper shoe. The invention is characterized in that side blocks provided with stopper members for covering the side edges of the upper shoe from above are provided on both sides in a direction perpendicular to the bridge axis direction of the rubber-like elastic bearing body. It is.

The sliding surface between the upper shoe and the slide plate has a stainless steel plate and polytetrafluroethylene (P
It is also possible to interpose a low friction member such as TEF). The present invention is configured as described above, and sets the upper shoe at the center of the fulcrum of the upper structure, and sets the lower shoe at the center of the fulcrum of the lower support structure. A pre-shearing deformation of an amount corresponding to the amount of deformation of the upper structure is applied to the rubber-like elastic support interposed via a slide plate between the lower shoe and the upper structure via a pre-shear holding device in a direction opposite to the deformation direction of the upper structure. Direction, and a stopper member is interposed in the gap between the upper shoe and the slide plate,
At the point when the deformation of the upper structure is completed, the rubber-like elastic bearing is constructed by performing the construction so that the center of the fulcrum of the upper structure, the rubber-like elastic bearing, and the center of the fulcrum of the lower supporting structure are vertical. It functions as a sliding bearing during the construction of the bridge, and after completion of the construction, an effect equivalent to the preliminary shearing deformation is obtained, and the upper structure is safely held against horizontal shaking and vertical vibration. At the time of construction, installation is easy and workability can be improved.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a half cross-sectional view of a rubber elastic support device for a bridge used at a bridge end according to an embodiment of the present invention, in a direction perpendicular to the bridge axis direction (width direction of a bridge girder, arrow X direction in the figure), FIG. 2 shows a half cross-sectional view of a rubber elastic bearing device for a bridge in the bridge axis direction (longitudinal direction of the bridge girder, arrow Y direction in the drawing). The rubber elastic bearing device for a bridge is a superstructure such as a concrete bridge girder. A plurality of intermediate steel plates are provided between an upper shoe 2 (upper metal plate) supported on the lower surface of the object 1 and a lower shoe 4 (lower metal plate) supported by a lower support structure 3 such as a pier. 5 and a rubber-like elastic bearing member 7 integrally formed by laminating an unvulcanized rubber sheet 6.

A slide plate 9 is integrally mounted between the upper shoe 2 and the rubber-like elastic support 7 via a shear key 8 a on the upper surface of the rubber-like elastic support 7. Stainless steel plate 10a and polytetrafluroethylene (PTEF)
A low friction member 10 such as 10b is provided. The lower shoe 4 and the lower surface of the rubber-like elastic support 7 are fixed via a shearing key 8b.

On both sides of the rubber-like elastic bearing member 7 in a direction perpendicular to the bridge axis direction, a side provided with a stopper member 11 having a substantially L-shaped cross section to cover the side edge 2a of the upper shoe 2 from above. The block 12 is erected on the lower shoe 4 and, as shown in FIGS. 2 and 3, the upper shoe 2 is provided on the side of the rubber elastic support device for the bridge in the bridge axis direction (direction of arrow Y). An amount of pre-shearing deformation corresponding to the amount of deformation of the upper structure 1 is applied to the rubber-like elastic support 7 interposed between the lower shoe 4 and the slide plate 9 via the slide plate 9 in a direction opposite to the deformation direction of the upper structure 1. A pre-shear holding device 13 is provided.

In the pre-shearing holding device 13, a bolt 15 is inserted from a horizontal direction into a nut member 14 fixed to a lower portion of the upper shoe 2, and a tip of the bolt 15 is screwed into a side surface of the slide plate 9. Fixed. And
A jack (not shown) is attached to the base end side of the bolt 15. Therefore, the bolt 1 attached to the upper shoe 2
When the rubber-like elastic bearing 7 is moved in the horizontal direction via the jack, the rubber-like elastic bearing 7 moves the rubber-like elastic bearing 7 via the low-friction member 10 and the slide plate 9 by an amount corresponding to the amount of deformation of the upper structure 1. Can be given in the direction opposite to the direction of deformation of the upper structure 1.

The upper shoe 2 and the slide plate 9 can be integrally fixed. Next, the construction method of the rubber-like elastic bearing method for bridges is shown in FIG.
This will be described with reference to (b) and (c). First, as shown in FIG. 4A, the upper shoe 2 is set at the fulcrum center P of the upper structure 1, and the lower shoe 4 is set at the fulcrum center Q of the lower structure 3.

Then, as shown in FIG. 4 (b), after the completion of the erection of the upper structure 1, a rubber-like elastic bearing is interposed between the upper shoe 2 and the lower shoe 4 via a slide plate 9. The amount of pre-shear deformation corresponding to the amount of deformation of the upper structure 1 (dry shrinkage, creep, etc. of a bridge girder during the construction of a concrete bridge) is reversed to the deformation direction of the upper structure 1 on the body 7 via the pre-shear holding device 13. Give in the direction and put. Then, a stopper member 16 such as a spacer is interposed in the gap S between the upper shoe 2 and the slide plate 9.

When the deformation of the upper structure 1 is completed, the center P of the fulcrum of the upper structure 1 and the center Q of the rubber-like elastic bearing 7 are set as shown in FIG. Is to be placed vertically. The rubber-like elastic bearing member 7 is constructed by the above-described method.
However, it functions as a sliding bearing during the construction of the bridge, and after completion of the construction, an effect equivalent to the preliminary shearing deformation can be obtained, and the upper structure 1 can be safely held against horizontal shaking and vertical vibration. In addition, it is easy to attach during construction and can improve workability.

Although the above embodiment has been described with reference to the upper structure 1 such as a concrete bridge girder, the present invention can also be applied to a steel bridge girder.

[0017]

The present invention is constructed as described above, and has the following excellent effects. . The rubber-like elastic bearing body functions as a sliding bearing during the construction of the bridge, and after completion of the construction, an effect equivalent to the preliminary shearing deformation can be obtained. . The upper structure can be safely held against horizontal shaking and vertical vibration. . At the beginning of construction, the upper and lower shoes can move independently of each other, which facilitates positioning and the like, and facilitates installation and improves workability during construction. . It is possible to apply any pre-shear to the rubber-like elastic bearing. . By using it near the end fulcrum, the contraction amount of the bridge girder is canceled, and as a result, a more compact rubber-like elastic bearing can be obtained. . It is easy to design a support for a continuous bridge between very large diameters.

[Brief description of the drawings]

FIG. 1 is a half cross-sectional view of a rubber-like elastic bearing device for a bridge used at a bridge end according to an embodiment of the present invention, in a direction orthogonal to a bridge axis direction (an arrow X direction).

FIG. 2 shows the direction of the bridge axis (arrow Y) of a rubber-like elastic bearing device for a bridge.
(Direction).

FIG. 3 is a partially enlarged side view of a pre-shear holding device.

FIGS. 4 (a), (b) and (c) are explanatory views showing construction steps of a rubber-like elastic bearing method for a bridge.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Upper structure 2 Upper shoe 3 Lower supporting structure 4 Lower shoe 5 Intermediate steel plate 6 Unvulcanized rubber sheet 7 Rubber-like elastic bearing 8a, 8b Shear key 9 Slide plate 10a Stainless steel plate 10b Polytetrafluroethylene (PTEF) DESCRIPTION OF SYMBOLS 10 Low friction member 11 Stopper member 12 Side block 13 Pre-shear holding device 14 Nut member 15 Bolt 16 Stopper member P Center of fulcrum of upper structure Q Center of fulcrum of lower structure S Playing part

Claims (3)

[Claims] 1. An upper shoe is set at a center of a fulcrum of an upper structure, and a lower shoe is set at a center of a fulcrum of a lower support structure. A pre-shearing amount corresponding to the amount of deformation of the superstructure is applied to the rubber-like elastic bearing member interposed via a slide plate in the direction opposite to the deformation direction of the superstructure through a pre-shear holding device. A stopper member is interposed in the gap between the upper shoe and the slide plate, and when the deformation of the upper structure is completed, the fulcrum center of the upper structure and the fulcrum center of the rubber-like elastic bearing body and the lower support structure. A rubber-like elastic bearing method for bridges that is installed so that it is vertical. 2. A rubber-like elastic support is interposed between an upper shoe supported by an upper structure and a lower shoe supported by a lower support structure, and the rubber-like elastic support is provided. To
In a rubber elastic bearing device for a bridge configured to give a pre-shearing deformation of an amount corresponding to a deformation amount of an upper structure in a direction opposite to a deformation direction of the upper structure, the rubber elastic bearing and the upper shoe are provided. A slide plate slidable in the bridge axis direction is provided integrally with the rubber-like elastic bearing body between the upper shoe and the upper shoe on both sides of the rubber-like elastic bearing body in a direction orthogonal to the bridge axis direction. A rubber-like elastic bearing device for a bridge provided with a side block provided with a stopper member that covers a side edge from above. 3. The rubber-like elastic bearing device for a bridge according to claim 2, wherein a low friction member is interposed on a sliding surface between the upper shoe and the slide plate.