JPH0627908U - Pre-shear deformation holding device for rubber bearing material - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a compact, lightweight, and low-cost pre-shear deformation holding device with a simple structure that does not require a special jig for shearing the rubber support material. [Structure] A pair of holders 11 and 12 having different thicknesses from the outer side surface to the inner side surface and having different upper and lower lengths are turned upside down so as to face each other in the front and rear direction. A nut 14 is screwed onto the end of the bolt that protrudes to the outside of the other holder 12 by penetrating a long bolt 13 from the outside of the holder 11 in the front-rear direction to form a rubber laminate between the holders 11 and 12. Alternatively, a pre-shear deformation holding device for a rubber bearing material, which sandwiches and holds the bearing material 2 made of a rubber structure having the same function.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus for pre-shear-deforming a support member composed of a rubber laminate or the like interposed between a lower structure such as a bridge pier and an upper structure such as a bridge girder.

[0002]

[Prior art]

 When an upper structure such as a concrete bridge girder is supported on a lower support structure such as a bridge pier via a rubber bearing material, the structure expands and contracts due to temperature changes, and especially the concrete bridge girder, etc. is dried and contracted by creep or the like. Direction (front-rear horizontal direction) and the upper and lower structures are displaced from each other, so that the rubber bearing member is sheared in the bridge axial direction.

In addition to absorbing the bridge girder expansion and contraction displacement due to temperature change, which is the original function of the rubber support material, in order to absorb the concrete shrinkage change, the structure is strengthened and the height of the rubber support material is increased. Need a way.

However, in any case, there are many adverse effects on the design and the cost also increases. Therefore, a method of applying shear deformation to the rubber bearing material in the direction opposite to the deformation direction of the structure in advance has been conventionally used, and various shear deformation holding devices for that purpose have been proposed.

An example described in Japanese Patent Laid-Open No. 62-45803 will be described with reference to FIGS. 6 and 7. The rubber support member 01 has a rectangular upper metal plate 03 and a lower metal plate 04 integrally fixed to the upper surface and the lower surface of a flat and substantially cubic rubber layer 02, and has locking projections at the centers of the upper and lower metal plates 03 and 04. Origins 03a and 04a are provided, respectively.

The upper and lower metal plates 03, 04 of the rubber support member 01 are displaced back and forth with each other using a special jig by utilizing the locking projections 03a and 04a, and the rubber layer 02 is preliminarily sheared and deformed. In this state, a metal front support member 08 including a lower surface plate 05, an upper surface plate 06 having a shorter front-rear width, and a plurality of ribs 07 that connect them is arranged at the front portion of the rubber support member 01, and similarly. A metal rear support member 012 consisting of a bottom plate 09, a longer front plate 010 having a longer front-rear width and ribs 011 is arranged at the rear of the rubber support member 01, and the metal support members 08 and 01 2 are used to support the rubber support member 01. The metal connecting members 013, 014 arranged on the left and right sides of the rubber support member 01 sandwich the front and rear metal front supporting members 08, 012, and the left and right metal connecting members 013, Bolts 015 and 017 penetrate the front and rear ends of 014, respectively, and they are screwed and tightened with nuts 016 and 018.

In this way, the rubber support member 01 is sandwiched between the front and rear metal support members 08 and 012, and the two metal support members 08 and 012 are connected by the left and right metal connection members 013 and 014, respectively. When held by the bolts 015 and 017 and the nuts 016 and 018, the jig that shear-deformed the rubber support member 01 is removed, and the lower metal plate 04 is fixed to the upper surface of the lower structure such as the bridge pier. An upper structure such as a bridge girder is formed on the 03 by pouring concrete.

After the concrete curing period has passed, the bolts 015 and 017 that are held through in the left and right direction are removed, and the metal connecting members 013 and 014 and the metal supporting members 08 and 012 are removed. In this way, the upper structure is supported by the rubber bearing material that has been shear-deformed in advance.

[0009]

[Problems to be solved]

 As described above, the conventional device for holding the shear deformation of the rubber bearing member 01 requires a jig for specially shearing the rubber bearing member 01, and the holding device is widely arranged around the rubber bearing member 01. Since it is installed and constructed by combining many members, it is large, heavy and costly, and its structure is complicated and workability is poor.

Further, since the force for returning to the original state due to the shear deformation of the rubber bearing member 01 acts on the preliminary shear holding device, when the holding device is detached from the rubber bearing member 01, the rubber bearing member 01 is further re-attached. It must be removed by shearing so that holding force is not applied. The other conventional examples also require a jig and the workability is poor.

The present invention has been made in view of the above point, and its object is to reduce the size and weight of a supporting member without the need for a jig for cutting and deforming the supporting member and a jig for removing the supporting member. The point is to provide a preliminary shear deformation holding device that has a simple structure with low cost and good workability.

[0012]

[Means and Actions for Solving the Problems]

 In order to achieve the above object, the present invention has a pair of holders having different thicknesses from the outer side surface to the inner side surface, the upper and lower portions having different predetermined lengths, which are turned upside down and face each other in the front-back direction. , A long bolt is penetrated from the outside of one holder in the front-rear direction, and a nut is screwed onto the end of the bolt that protrudes to the outside of the other holder, and a rubber laminate or an equivalent function is provided between both holders. A pre-shear deformation holding device for a rubber bearing that sandwiches and holds a bearing made of a rubber structure having

The front and rear holders have a simple structure in which a bolt penetrates and is screwed with a nut, which is small, lightweight, and low cost, and the shear deformation holding device itself can shear deform the support member and has a special jig. You don't need any ingredients.

[0014]

【Example】

 An 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 member 1 is held by the preliminary shearing deformation holding device 10. The support member 1 is composed of a rubber laminate 2 having upper and lower surfaces to which a metal upper plate 3 and a lower plate 4 are fixed.

The rubber laminate 2 is formed by embedding a plurality of metal plates in a rubber body so as to alternately form rubber layers, and has a flat cubic shape as a whole, and is fixed to the upper and lower surfaces thereof. The upper plate 3 and the lower plate 4 are rectangular and extend in all directions from the rubber laminate 2.

The pre-shear deformation holding device 10 is one in which a long bolt 13 penetrates the front and rear holders 11 and 12 and is screwed with a nut 14 to tighten them. The front and rear holders 11 and 12 have the same shape and are symmetrically used upside down.

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

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

The holders 11 and 12 are opposed to each other, and bolt holes are formed coaxially to penetrate the bolts 13. The preliminary shearing deformation holding device 10 is arranged on the left and right sides of one supporting member 1.

2 and 3 are side views showing a method of shearing and deforming the rubber laminated body 2 and a holding state thereof. As shown in FIG. The pair of holders 11 and 12 are opposed to each other in the left-right side, and the upper surface 11a of the holder 11 is applied to the front side surface of the upper plate 3 of the support member 1, and the lower vertical surface 12b of the holder 12 is arranged. To the rear surface of the lower plate 4 of the support member 1 so that the bolt 13 penetrates the bolt hole of the holder 11 from the front side and the rubber laminate 2 sideways to penetrate the bolt hole of the holder 12 and protrudes rearward. The nut 14 is screwed into the threaded portion (state shown in FIG. 2).

After mounting the preliminary shearing deformation holding device 10 on both the left and right as described above, when the nut 14 is further screwed in, the holding tool 11 on the front side pushes the upper plate 3 of the support member 1 rearward, and the rear side. The holder 12 pushes the lower plate 4 of the support member 1 to the front, and displaces the upper plate 3 and the lower plate 4 in opposite directions to cause shearing deformation in the rubber laminate 2.

Even if a smaller force is applied to the screw mechanism of the bolt 13 and the nut 14, a large force acts on the support member 1 so that it can be easily sheared and deformed.

In this way, the nut 14 is screwed in until the upper plate 3 and the lower plate 4 are sandwiched by the holders 11 and 12, and the shear deformation of the rubber laminate 2 is completed, and the shear deformation is maintained (FIG. 1 and FIG. 1). (See FIG. 3).

Since the preliminary shearing deformation holding device 10 causes the rubber laminate 2 to undergo shearing deformation in this way, no special jig for special shearing deformation is required.

The supporting member 1 thus shear-deformed and held by the preliminary shear-deformation holding device 10 is fixed to the upper surface of the bridge pier 5 with the shear deformation direction being the bridge axis direction. This fixing is performed by an anchor member or the like that is planted in the pier 5. Then, the formwork constituting the bridge girder 6 is arranged 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 thus fixed to the bridge girder 6 and the bridge pier 5, respectively, the nut 14 is loosened, and the holding fixtures 11 and 12 before and after releasing the pre-shear deformation. The holding device 10 can be easily removed, and at this time also, a special jig for removing the preliminary shearing deformation holding device 10 is not required.

FIG. 5 shows a state in which the preliminary shearing deformation holding device 10 is removed. Since the support member 1 is interposed between the bridge pier 5 and the bridge girder 6 in a state where the rubber laminate 2 is sheared and deformed in the bridge axis direction in advance, the strength of the pier 5 can be increased against expansion and contraction of the bridge girder 6. It can be dealt with without increasing the size of the rubber stack. As described above, the preliminary shearing deformation holding device 10 of the present embodiment has an extremely simple structure including the pair of holding tools 11 and 12 and the bolts 13 and 14, and is small in size, light in weight, low in cost and excellent in workability.

[0029]

[Effect of device]

 According to the present invention, since the rubber laminated body of the support material can be sheared and deformed and held by tightening the pair of holders with the bolts and nuts, no special jig for shearing deformation is required. . Similarly, no special jig is required when removing the retainer. The simple structure of a pair of holders and bolts and nuts makes it compact, lightweight, low cost, and easy to work with.

[Brief description of drawings]

FIG. 1 is a perspective view of a preliminary shear deformation holding device and a support member according to an embodiment of the present invention.

FIG. 2 is a side view of a preliminary shear deformation holding device and a support member immediately before shear deformation.

FIG. 3 is a side view of a preliminary shearing deformation holding device and a support member after shearing deformation.

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

5 is a cross-sectional view showing a state in which the preliminary shearing deformation holding device in FIG. 4 is removed.

[Explanation of symbols]

1 ... Support material, 2 ... Rubber laminate, 3 ... Upper plate, 4 ... Lower plate, 5
… Bridge piers, 6… Bridge girders, 10… Preliminary shear deformation holding device, 11,
12 ... Retainer, 13 ... Bolt, 14 ... Nut,

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 10, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 6

[Correction method] Added

[Correction content]

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

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 7

[Correction method] Added

[Correction content]

FIG. 7 is a plan view of the same.

Claims (1)

[Scope of utility model registration request] 1. A pair of holders having different upper and lower thicknesses from the outer side surface to the inner side surface and having different predetermined lengths are turned upside down so as to be opposed to each other in the front-rear direction. A long rubber bolt that penetrates in the front-rear direction and is screwed with a nut at the end of the bolt that protrudes to the outside of the other holder, and consists of a rubber laminate or a rubber structure having the same function between both holders. A pre-shear deformation holding device for a rubber bearing material, characterized by sandwiching and holding the bearing material.