JP2895833B1 - Pre-shear deformation holding member, holding device, and holding method for rubber bearing - Google Patents

Abstract

An object of the present invention is to provide a structure which does not require removal of a rubber bearing shear deformation holding member after a concrete of an upper structure is hardened. SOLUTION: An agitator 1 comprising a first member 2 and a second member 3 connected so as to be able to contract and move by receiving a predetermined compressive force, and one end of the agitator 1 is attached to a lower portion of a rubber bearing body 14. The lower end of the lower metal plate 12 is locked by the reaction wall 21, and the other end of the adjuster 1 is locked by the locking portion 22 of the upper metal plate attached to the upper portion of the rubber bearing body 14 that has been pre-sheared. It is characterized by the following configuration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member, an apparatus and a method for retaining a pre-shear deformation of a rubber bearing disposed between an upper structure such as a bridge girder and a lower structure such as a pier or an abutment. is there.

[0002]

2. Description of the Related Art Conventionally, as a method of preliminarily shearing and setting a rubber bearing between an upper structure and a lower structure, a method of installing the rubber bearing is as follows.
Various methods according to the prior application of the present applicant, such as JP-A-63-247407 and JP-A-3-2407, have been proposed.

[0003] The technique common to these conventional rubber bearing body pre-shear deformation devices is that one end of a shear deformation urging jack is engaged with a lower metal plate side fixed to the lower portion of the rubber support, and the jack is jacked. A stopper that urges the rubber bearing body to shear by pressing and moving the upper metal plate fixed to the upper part of the rubber bearing body in the shear direction on the other working side, and preventing the upper metal plate from returning in this state. Is interposed between the lower metal plate and the upper metal plate, and thereafter the jack for biasing the shear deformation is removed.

[0004] Thereafter, the sheared rubber bearing is mounted on the lower structure via the lower metal plate of the rubber bearing, and then concrete of the upper structure is poured over the sole plate placed on the upper metal plate. Thereafter, when the concrete of the upper structure is hardened, the stopper that holds the preliminary shear deformation is removed, so that the rubber bearing that has been sheared and deformed following the contraction of the upper structure returns to the normal posture.

[0005]

As described above, in the prior art, it is necessary to remove the stopper after the concrete of the upper structure has hardened, but both ends of the stopper are provided with a reaction wall on the lower metal plate side. The locking part on the upper metal plate side,
Since the concrete is contracted strongly due to the contraction of the concrete, the work of removing the stopper at the construction site is difficult and a large-scale work.

It is an object of the present invention to provide a pre-shearing deformation holding member, an apparatus and a method for a rubber bearing, which do not require a difficult removal operation of the stopper.

[0007]

In order to achieve the above object, a pre-shearing deformation holding member of a rubber bearing according to the present invention is connected to be capable of contracting or extending under a predetermined compressive stress or tensile stress. It is characterized by comprising an Asia star composed of a first member and a second member. Also, the present invention provides that the first member of the adjuster is constituted by a coupler having a predetermined length having a female screw, and the second member is constituted by a length adjusting member having a male screw screwed into the female screw. Features. In addition, the pre-shear deformation holding device for a rubber bearing according to the present invention includes an agitator including a first member and a second member connected to be able to contract and move by receiving a predetermined compressive force, and one end of the agitator is provided with one end of the rubber. The bearing is locked to a reaction wall of a lower metal plate integral with the bearing, and the other end of the adjuster is locked to a locking portion of an upper metal plate integral with the rubber bearing subjected to preliminary shear deformation. And The method for holding a pre-shear deformation of a rubber bearing according to the present invention is characterized in that one end of an adjuster including a first member and a second member connected to be able to contract and move under a predetermined compressive force is connected to a lower metal integrated with the rubber bearing body. The other end of the adjuster is locked to a locking portion of an upper metal plate integral with the pre-shear deformed rubber support, and the pre-shear deformed rubber support is fixed to the lower structure. It is characterized in that it is fixed on an upper part of an object, and concrete of a concrete upper structure is cast on a sole plate placed on the upper metal plate and hardened.

According to the present invention, the concrete of the superstructure hardens and shrinks with the passage of time, and the force for returning the sole plate in the direction opposite to the shear deformation direction due to the shrinkage is caused by the force of the adjuster. When the coupling strength of the connecting portion connecting the first member and the second member is exceeded, the first member and the second member are moved in a direction in which the entire length of the adjuster is shortened or elongated by breaking the connecting portion. Relative movement, the upper part of the rubber bearing is allowed to return, and returns to the normal posture. Thereafter, the Asia Star can be easily removed from the installation site and does not require difficult extraction operations.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 (a) and 1 (b) show a first example of an adjuster 1 for holding a pre-shear deformation of a rubber bearing according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) show a second example of the adjuster 1. Here is an example. The Asia star 1 shown in FIG. 1 is configured by connecting a first member 2 and a second member 3 to each other so as to be able to move forward and backward. The first member 2 is a coupler having a predetermined length L and having a female screw 4 on the inner periphery. The second member 3 is the first member
Which has an external thread 5 of a predetermined length L ₁ to be screwed into the female thread 4 of the member 2, the internal thread 4 integral shank 6 and a structure having a mount 7 integral with the shaft portion 6, the length adjustment member Also works as A bolt insertion hole 8 is formed in the mounting base 7.

A male screw 5 of the second member 3 is screwed to the female screw 4 of the first member 2 via a screw thread by the length of the dimension L _1. to the extent that threaded coupling section 9 of the dimension L ₁ can withstand destruction held its screwed state, screwed connection part 9 by exceeding the limit of resistance to fracture force is broken, the first member 2 and the second member 3 is relatively moved in a direction to reduce its overall length L _2.

[0011] rupture strength against shrinkage stress applied from both ends of the Ajiyasuta 1 is determined by the length of the threaded dimension L ₁ between the female thread 4 and the male screw 5. Therefore, possible resistance to fracture strength against the shrinkage stress by adjusting the dimension L ₁ variable. The most simple example to increase its resistance to breaking strength, screwed from the opposite side male thread 5 and screwed side in adjusting male screw member 10 of the first member 2 having a dimension L ₃ as shown in FIG. 2 it is thereby possible to exert a fracture strength which is the sum of the dimensions L ₃ dimensions L ₁ and the adjustment male screw member 10 of the male thread 5 on Ajiyasuta 1.

FIGS. 3 to 5 show examples in which the above-mentioned adjuster star 1 is applied to a rubber bearing for a bridge, and the shearing deformation of the rubber bearing body is maintained. In each of the drawings, a rubber bearing 14 is formed by a rubber layer 11, a lower metal plate 12 fixed to a lower portion thereof, and an upper metal plate 13 fixed to an upper portion of the rubber layer 11.
A pair of bolt insertion holes 23 is formed on both sides of the upper structure 20 in the width direction (left-right direction) of the base plate 15 to which the lower metal plate 12 is fixed, in the longitudinal direction (front-rear direction) of the upper structure 20. At intervals,
Reaction walls 21 for the adjuster 1 are fixed to both sides of the base plate 15 in the width direction of the upper structure 20 at the center in the longitudinal direction of the upper structure by welding.

On both sides in the width direction of the upper structure 20 in the sole plate 33 fixed on the upper metal plate 13,
A recess 26 for accommodating the adjuster 1 is provided, and an anchor member 30 fixed to the sole plate 33 is embedded in the upper structure 20.

A lower bolt 36 is inserted into each of the bolt insertion holes 23 of the base plate 15 from above, and the lower bolt 36 is screwed to the female screw member 19 which is screwed with a flanged anchor member 28 at a lower portion and fixed by welding. And
The upper surface of the female screw member 19 is pressed against the lower surface of the base plate 15. The lower female screw member 16 with the anchor member is formed by the anchor member 28 and the female screw member 19.
Is configured.

In the above configuration, as shown in FIG.
After urging the rubber bearing member 14 with preliminary shearing deformation by using a jack (not shown), the adjuster 22 having a predetermined length is disposed on the locking portion 22 of the sole plate 33 as shown in FIG. Then, the mounting base 7 of the second member 3 is fixed to the locking portion 22 of the sole plate 33 by bolts (not shown), and the other end of the first member 2 of the adjuster 1 is
The shear deformation of the rubber bearing member 14 given by a predetermined amount is maintained by the adjuster 1.

While pre-shear deformation of the rubber bearing 14 shown in FIG. 3 is maintained, concrete is cast on the upper side of the sole plate 33 to construct the upper structure 20. When the concrete of the upper structure 20 is hardened and the contraction period elapses, a stress is applied to the adjuster 1 to shrink it, and the force acts on the adjuster 1 and the first member 2 holding the adjuster 1 at a predetermined length. When the breaking strength of the screw connection portion 9 with the two members 3 is exceeded, the screw connection portion 9 is broken and the first member 2
Then, the second member 3 moves in the direction in which the length of the adjuster 1 is reduced. The breaking strength of the threaded connection 9 between the first member 2 and the second member 3 is about 1.5 times the preliminary shearing force of the rubber bearing 14.
It is good to design so that it breaks about twice.

When the adjuster 1 is broken and the overall length is shortened, the adjuster 1 may be removed from the installation place, and the removing operation does not involve any difficulty. When the asyster star 1 is broken, one end of a chain (not shown) is connected to each of the first member 2 and the second member 3 in order to eliminate the danger of the asyster star 1 dropping from a high installation location. It is preferable that the other end of the chain be locked to a fixed side such as a reaction wall 21 fixed to the lower metal plate 12, for example.

Further, the first member 2 and the second member
The connection structure with the member 3 is not limited to the illustrated screw connection structure.
For example, instead of the female screw 4 of the coupler constituting the first member 2, a locking shaft (not shown) which penetrates the peripheral wall in the diametrical direction and breaks by receiving a certain force or more is provided, and the male screw of the second member 3 is provided. It is also possible to make a design change such that the portion 5 is formed in a shaft shape, inserted into the first member 2 and locked on the above-described locking shaft. Furthermore, in the embodiment of the present invention, an example in which the intended purpose is achieved by applying a compressive stress to the adjuster 1 has been described. Conversely, by applying a tensile stress to the adjuster 1, the intended purpose is achieved. Can be easily changed by those skilled in the art.

[0019]

As described above, according to the present invention,
The first member and the second member, which retain the preliminary shearing deformation of the rubber bearing, move relative to each other in a direction of shortening or elongating the overall length of the rubber bearing by breaking the connecting portion under a predetermined compressive stress and tensile stress.
Since the Azistar is composed of members, the rubber bearing is installed at a predetermined location, and when the concrete structure is cured and shrunk, the Azistar is naturally broken,
There is an excellent effect that the work of removing the adjuster star is remarkably simpler and less dangerous than the work of removing the conventional shear deformation holding stopper.

[Brief description of the drawings]

FIG. 1A is a cutaway side view in which a first member and a second member of an adjuster according to a first embodiment of the present invention are separated,
(B) is a fracture side view which combined the 1st member and the 2nd member.

FIG. 2A is a cutaway side view in which a first member, a second member, and an adjustment screw member of an adjuster according to a second example of the present invention are separated, and FIG. 2B is an adjustment with the first member and the second member. It is a fracture | rupture side view which combined the screw member.

FIG. 3 is a cross-sectional view showing a state in which a rubber bearing shear deformation is held by a bridge bearing device using an adjuster as an embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adjuster 2 1st member 3 2nd member 4 Female screw 5 Male screw 6 Shaft part 7 Mounting stand 8 Bolt insertion hole 9 Screw connection part 10 Male screw member for adjustment 11 Rubber layer 12 Lower metal plate 13 Upper metal plate 14 Rubber bearing Reference Signs List 15 base plate 16 lower male screw member 17 lower structure 19 female screw member 20 upper structure 21 reaction wall 22 locking portion 23 bolt insertion hole 26 concave portion 28 anchor member with flange 30 anchor member 31 female screw member 33 G 36 volts

Claims (4)

(57) [Claims] 1. A pre-shearing deformation retaining member for a rubber bearing, comprising an adjuster including a first member and a second member connected to be able to contract or extend under a predetermined compressive stress or tensile stress. 2. The first member of the adjuster star is constituted by a coupler having a predetermined length having an internal thread, and the second member is constituted by a length adjusting member having an external thread engaged with the internal thread. A pre-shear deformation retaining member for the rubber bearing as described in the above. 3. An agitator comprising a first member and a second member connected so as to be able to contract and move by receiving a predetermined compressive force, one end of which is opposite to a lower metal plate integral with a rubber bearing. A pre-shearing deformation holding device for a rubber bearing, characterized in that it is locked to a force wall, and the other end of the adjuster is locked to a locking portion of an upper metal plate integral with the pre-sheared rubber bearing. . 4. An end of an adjuster comprising a first member and a second member connected to be able to contract and move under a predetermined compressive force is engaged with a reaction wall of a lower metal plate integral with a rubber bearing. The other end of the adjuster is locked to a locking portion of an upper metal plate integral with the pre-shear-deformed rubber support, and the pre-shear-deformed rubber support is fixed to the upper part of the lower structure, and A pre-shear deformation retaining method for a rubber bearing, wherein concrete of a concrete upper structure is cast and hardened on a sole plate placed on an upper metal plate.