JP2560974Y2 - Pre-shear deformation holding device for rubber bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preliminarily shearing and deforming a support material such as a rubber laminate interposed between a lower structure such as a pier and an upper structure such as a bridge girder.

[0002]

2. Description of the Related Art When an upper structure such as a concrete bridge girder is supported on a lower support structure such as a pier through a rubber bearing, the structure expands and contracts due to a change in temperature. By contracting in the direction of the bridge axis (horizontal direction), the upper and lower structures are displaced from each other, so that the rubber bearing member is sheared in the direction of the bridge axis.

In order to absorb the above-mentioned concrete shrinkage change in addition to absorbing the bridge girder expansion and contraction displacement due to temperature change, which is the original function of the rubber bearing material, a method such as strengthening the structure and increasing the height of the rubber bearing material is used. is required.

[0004] In any case, however, the adverse effects on the design increase and the cost also increases. Therefore, a method in which a shear deformation in the direction opposite to the deformation direction of the structure is given to the rubber bearing material in advance has conventionally been adopted, and various shear deformation holding devices for that purpose have been proposed.

For example, an example described in Japanese Patent Application Laid-Open No. Sho 62-45803 will be described with reference to FIGS. A rubber support member 01 has a rectangular upper metal plate 03 and a lower metal plate 04 integrally fixed on the upper and lower surfaces of a flat, substantially cubic rubber layer 02, and a locking projection at the center of each of the upper and lower metal plates 03, 04. 03a and 04a are provided respectively.

The upper and lower metal plates 03 and 04 of the rubber bearing material 01 are displaced back and forth with a special jig using the locking projections 03a and 04a, so that the rubber layer 02 is deformed in advance by shearing.
In this state, the lower plate 05 and the upper plate having a shorter front-rear width are used.
A metal front support member 08 comprising a plurality of ribs 07 for connecting these members is disposed at the front of the rubber support member 01, and a lower plate 09, a longer upper and lower front plate 010 and a rib are also provided.
A metal rear support member 012 comprising a metal support member 012 is disposed at a rear portion of the rubber support member 01, and the metal support members 08 and 012 sandwich the rubber support member 01, and are disposed on the left and right sides of the rubber support member 01. The connecting members 013 and 014 are front and rear metal front bearing members 08 and
Bolts 015 and 017 penetrate the left and right ends of the left and right metal connecting members 013 and 014, respectively, and are screwed and tightened with nuts 016 and 018.

In this manner, the metal bearing members 08 and 012 sandwich the rubber bearing member 01 from the front and rear, and the two metal bearing members 08 and 012 are sandwiched.
When the left and right metal connecting members 013 and 014 are connected to each other and held by the front and rear bolts 015 and 017 and the nuts 016 and 018, the jig that has sheared and deformed the rubber bearing material 01 is removed, and the bridge pier and the like are removed. A lower metal plate 04 is fixed on the upper surface of the lower structure, and an upper structure such as a bridge girder is formed on the upper metal plate 03 by casting concrete.

After the curing period of the concrete has elapsed, the bolts 015 and 017 that have been penetrated and held in the left-right direction are removed, and the metal connecting members 013 and 014 and the metal bearing members 08 and 012 are removed. Thus, the upper structure is supported by the rubber bearing material that has been sheared in advance.

[0009]

As described above, the conventional device for holding the shear deformation of the rubber bearing material 01 requires a special jig for shearing and deforming the rubber bearing material 01, and the holding device requires a rubber bearing. Since it is largely arranged around the material 01 and is configured by combining many members, it is large, heavy and expensive, and has a complicated structure and poor workability.

[0010] The pre-shearing and holding device includes a rubber bearing material.
Since the force to return to the original state due to the shear deformation of 01 is working, when removing the holding device from the rubber bearing material 01, it is necessary to further deform the rubber bearing material 01 again so that the holding force is not applied and remove it. There is. Other conventional examples also require a jig and workability is poor.

The present invention has been made in view of the above points, and its object is to provide a compact, lightweight, and low-cost jig that does not require a jig for shearing and deforming the bearing material or a jig for removing the jig. Another object of the present invention is to provide a pre-shear deformation holding device having a simple structure and good workability.

[0012]

In order to achieve the above-mentioned object, according to the present invention, a pair of holders having different thicknesses from an outer surface to an inner surface having a predetermined length at an upper portion and a lower portion are turned upside down. And a nut is screwed into each of the holders, and a nut is screwed into a bolt end projecting outward from the other holder through a long bolt from the outside of one of the holders. A pre-shearing deformation holding device for a rubber bearing material that holds a bearing made of a rubber laminate or a rubber structure having an equivalent function between tools by holding the material in shear deformation.

[0013] It is a simple structure in which a bolt penetrates the front and rear holders and is screwed with a nut.
The shear deformation holding device itself can shear deform the support material, and does not require a special jig.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention shown in FIGS. 1 to 7 will be described below.

FIG. 1 is a perspective view showing a state in which the supporting material 1 is held by the preliminary shear deformation holding device 10. Bearing material 1
The upper plate 3 and the lower plate 4 made of metal are fixed to the upper and lower surfaces of the rubber laminate 2.

The rubber laminate 2 has a plurality of metal plates embedded in a rubber body so as to form layers alternately with a rubber layer.
The upper plate 3 and the lower plate 4 fixed on the upper and lower surfaces of the whole are in the shape of a flat cube, and the rubber laminate 2 has a rectangular shape.
More than four sides.

In the pre-shearing deformation holding device 10, a long bolt 13 penetrates the front and rear holding members 11, 12, and is screwed together with a nut 14 to be tightened. The front and rear holders 11 and 12 have the same shape and are used symmetrically facing upside down.

The shape of the front holder 11 will be described. The outer side surface and the left and right side surfaces form a vertical surface, the upper and lower side surfaces form a horizontal surface, and the inner side surface has upper and lower vertical surfaces 11a and 11b shifted forward and backward. The thickness from the side surface to the upper vertical surface 11a is thicker by a predetermined length than the thickness from the lower vertical surface 11b,
An inclined surface 11c is provided between the upper and lower vertical surfaces 11a and 11b.

One of the holders 12 has the same shape and is used upside down so as to face the holder 11, so that the thickness from the outer surface to the upper vertical surface 12a is larger than the thickness from the lower vertical surface 12b. It becomes thinner by a predetermined length.

The holders 11 and 12 are opposed to each other, and a bolt hole is formed coaxially so that the bolt 13 penetrates.
The pre-shearing deformation holding device 10 is disposed on the left and right with respect to one bearing material 1.

FIGS. 2 and 3 are side views showing a method of shearing and deforming the rubber laminate 2 and a holding state.
In order to shear-deform the rubber laminate 2 as shown in (1), a pair of holding tools 11 and 12 are opposed to each other on the left and right sides of the supporting material 1 and the upper vertical surface 11a of the holding tool 11 is The front side of the upper plate 3 is applied, the lower vertical surface 12b of the holder 12 is applied to the rear side of the lower plate 4 of the support member 1, and the bolt 13 is passed through the bolt hole of the holder 11 from the front. A nut 14 is screwed into a threaded portion of the retainer 12 which passes through the side of the laminate 2 and is screwed to the rear (a state shown in FIG. 2).

After the pre-shear deformation holding device 10 has been mounted on both the left and right in this way, when the nut 14 is further screwed in, the front holding tool 11 pushes the upper plate 3 of the support 1 backward,
The rear holder 12 pushes the lower plate 4 of the support 1 forward, displacing the upper plate 3 and the lower plate 4 in opposite directions to each other, causing the rubber laminate 2 to undergo shear deformation.

Even a small force acts on the screw mechanism of the bolt 13 and the nut 14, and a large force acts on the support member 1 so that the bearing member 1 can be easily sheared and deformed.

Thus, the upper plate 3 and the lower plate 4 are
The nut 14 is screwed in until the rubber laminate 2 is sandwiched by the nut 12 until the shear deformation is completed, and the shear deformation is maintained (see FIGS. 1 and 3).

As described above, since the preliminary shear deformation holding device 10 shear deforms the rubber laminate 2, a special jig for special shear deformation is not required.

The support member 1 thus shear-deformed and held by the preliminary shear-deformation holding device 10 is fixed to the upper surface of the pier 5 with the shear deformation direction being the bridge axis direction. This fixation is performed by an anchor member or the like implanted in the pier 5. Then, the formwork forming the bridge girder 6 is placed on the upper plate 3 and concrete is poured, and the upper plate 3 is fixed to the bridge girder 6 after the curing period of the concrete.

After the upper plate 3 and the lower plate 4 of the support member 1 are fixed to the bridge girder 6 and the pier 5, respectively, the nut 14 is loosened to release the holding by the front and rear holders 11 and 12, so that the preliminary shear deformation is performed. The holding device 10 can be easily removed, and no special jig for removing the preliminary shear deformation holding device 10 is required.

FIG. 5 shows a state in which the preliminary shear deformation holding device 10 is removed. Since the bearing material 1 is interposed between the pier 5 and the bridge girder 6 in a state where the rubber laminate 2 has been sheared in advance in the bridge axis direction, the strength of the pier 5 against the expansion and contraction of the bridge girder 6 can be increased. This can be dealt with without increasing the size of the laminate. As described above, the preliminary shear deformation holding device 10 of the present embodiment has a very simple structure including the pair of holders 11 and 12 and the bolts 13 and 14, and is compact, lightweight, inexpensive, and excellent in workability.

[0029]

[Effect of the Invention] The present invention is a special jig for shear deformation because the rubber laminate of the support material can be sheared and deformed and held by tightening a pair of holders with bolts and nuts. Do not need. Similarly, no special jig is required when removing the holder. Since the pair of holders and the bolts and nuts have a simple configuration, they are small and lightweight, low-cost, and have good workability.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pre-shearing deformation holding device and a supporting material according to an embodiment of the present invention.

FIG. 2 is a side view of a pre-shear deformation holding device and a supporting material immediately before shear deformation.

FIG. 3 is a side view of a pre-shear deformation holding device and a support material after shear deformation.

FIG. 4 is a cross-sectional view showing a state in which a bearing material shear-deformed by a preliminary shear deformation holding device is interposed between a pier and a bridge girder.

FIG. 5 is a cross-sectional view showing a state where a preliminary shear deformation holding device in FIG. 4 is removed.

FIG. 6 is a cross-sectional view of a conventional preliminary shear deformation holding device.

FIG. 7 is a plan view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Support material, 2 ... Rubber laminate, 3 ... Upper plate, 4 ... Lower plate, 5
... bridge pier, 6 ... bridge girder, 10 ... pre-shearing deformation holding device, 11,
12 ... Holder, 13 ... Bolt, 14 ... Nut,

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of holders having different thicknesses from an outer surface to an inner surface having a predetermined length at an upper portion and a lower portion are turned upside down so as to face back and forth, and both of the holders have the outer side of one of the holders. A nut is screwed into the end of the bolt that penetrates a long bolt in the front-rear direction and protrudes outward from the other holder, and is formed of a rubber laminate or a rubber structure having an equivalent function between the two holders. A pre-shearing deformation holding device for rubber bearings, characterized in that the bearings are sandwiched and deformed and held.