JP2527667B2 - Preliminary shear deformation installation method and preliminary shear deformation installation device for rubber bearing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method in which concrete, which is an upper structure, is dried between an upper structure such as a bridge girder and a lower structure such as a bridge pier or abutment for a certain period after being set and hardened. The present invention relates to a method and an apparatus for preliminarily shearing and deforming a rubber bearing until shrinkage reaches a shrinkage limit.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. 3-2407 discloses a method of preliminarily shearing and installing a rubber bearing between an upper structure and a lower structure by using a center hole jack and a towing rod. The method published by is known. In the case of this method, a metal locking member that extends in the width direction of the upper structure and protrudes upward is integrally provided at the end of the metal base plate in the extension and contraction direction of the upper structure, and the through hole is formed in the locking member. One end of the pulling rod inserted into the base plate is screwed into the female screw hole of the lower metal plate of the rubber bearing placed on the base plate, and one end face of the annular spacer fitted in the pulling rod is attached to the side face of the locking member. To the hollow piston of the center hole jack, the base end surface of the cylinder of the center hole jack fitted in the pulling rod is engaged with the other end surface of the annular spacer, and the female screw member is screwed to the other end of the pulling rod. After the concrete of the concrete superstructure which is engaged with the end of the rod and is constructed on the upper part of the rubber bearing is hardened,
The center hole jack moves the lower metal plate of the rubber bearing in the direction of contraction of the upper structure through the towing rod to pre-shear and deform the rubber layer of the rubber bearing, and then the center hole jack, the towing rod and the annular spacer. Have been removed. Further, in the past, JP-A-2-26600
The bearing system disclosed in Japanese Patent No. 8 and the bearing system disclosed in Japanese Patent Laid-Open No. 3-79481 are also known.

[0003]

In the case of the above-mentioned conventional pre-shear deformation installation method for rubber bearings, since the locking member largely protrudes upward from the base plate, the weight of the locking member-equipped base plate increases and the manufacturing is performed. The cost is high, and the amount of upward protrusion of the locking member is large, resulting in a poor appearance. Further, in the case of the above-mentioned conventional bearing system, since the upper metal plate having outward fitting flanges on both sides of the upper part is slidably fitted in the groove in the mounting member fixed to the bridge girder side, The mounting member and the upper metal plate are large (heavy weight) and must be machined with high precision. Furthermore, multiple male screw members are used as permanent parts, and the screw members shrink and the desired effect is not achieved. However, there is a drawback that the entire apparatus becomes extremely expensive. Furthermore, in the case of the above conventional bearing system,
Between the stopper on the base plate and the lower metal plate, a recess for arranging the jack is provided, or a notch for engagement of a special shape is provided on the lower metal plate and a pulling member of a special shape is used. As a result, the base plate or the lower metal plate becomes large and the processing becomes complicated, resulting in a high cost.
In addition, when foreign materials such as dust accumulate on the sliding surface (upper surface) of the fixed sliding plate when building an upper structure such as a bridge girder, and the lower metal plate is moved to preliminarily shear deform the rubber bearing. ,
The disadvantage is that the foreign matter must be eliminated.
It is an object of the present invention to provide a pre-shear deformation installation method and a pre-shear deformation installation device for a rubber bearing that solves the above problems.

[0004]

In order to advantageously solve the above-mentioned problems, in the pre-shear deformation installation method of the rubber bearing according to the present invention, the upper surface of the metal base plate 2 fixed to the upper portion of the lower structure 1 is installed. The lower metal plate 3 in the rubber bearing 5 including the lower metal plate 3 and the upper metal plate 4.
The lower metal plate 3 is locked to the metal base plate 2 at both ends of the sole plate 6 slidably mounted on the upper surface of the rubber bearing 5 and the upper structure. Corresponding to contraction of concrete, which is 7, is formed between the upper metal plate 4 and the reaction force bearing walls 8 and 9 provided at both ends of the sole plate 6 located in the preliminary shear deformation direction and the deformation release direction. A wide spacer 13 and a narrow spacer 12 are mounted in the large and small gaps, respectively, to fix the wide and narrow spacers 13 and 12 to the sole plate 6 with bolts 14 and to respectively form the reaction force bearing walls 8 and 9. The tips of the bolts 10 and 20 screwed into the abutment are brought into contact with the end surface of the upper metal plate 4, concrete which is the upper structure 7 is placed on the upper portion of the sole plate 6, and after the concrete is hardened, the wide width and the narrow width are reduced. Each of the width Each of gap of Hirohaba and Semahaba spacer 13
Then, the narrow spacer 13 is attached to the wide gap on the opposite side and fixed to the sole plate 6, and then the bolt 10 screwed into the reaction bearing wall 8 on the narrow gap side is screwed. Then, the upper metal plate 4 is pushed at its tip to widen the narrow gap to make a wide gap, and the wide spacer 13 is attached to the space to fix it to the sole plate 6, and further, the left and right reaction force bearing walls 8, The bolts 10 and 20 are unscrewed from the screw 9. Further, in the rubber bearing preliminary shear deformation installation device according to the present invention, the rubber bearing 5 is provided with the lower metal plate 3 and the upper metal plate 4 on the upper surface of the metal base plate 2 fixed to the upper portion of the lower structure 1. The lower metal plate 3 is placed, the lower metal plate 3 is locked to the metal base plate 2, and both ends of the sole plate 6 slidably placed on the upper surface of the rubber bearing 5 are attached. In addition, reaction force bearing walls 8 and 9 are provided at both ends of the sole plate 6 located in the pre-shear deformation direction and the deformation canceling direction in response to contraction of the concrete which is the upper structure 7, and the reaction force bearing walls 8 and 9. A gap that widens and narrows due to the sliding of the sole plate 6 is formed between 9 and both ends of the upper metal plate 4, and the gaps are mounted in the wide and narrow gaps.
A wide spacer 12 and a narrow spacer 13 which can be detachably fixed to the sole plate 6 by the bolts 10 and 20 are provided, and the bolts 10 and 20 for pressing the both end surfaces of the upper metal plate 4 at the tips are provided on the left and right reaction force bearing walls. It is characterized by a configuration in which it is screwed into 8 and 9.

[0005]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. First, as shown in FIGS. 1 to 7, a concrete lower structure in which a plurality of anchor members 15 are fixed to the lower portion and a metal base plate 2 having a square locking hole 16 in the center is a bridge abutment. The anchor member 15 is mounted on the upper surface of the lower structure 1 and embedded and fixed in the lower structure 1. Further, the lower metal plate 3 in the rubber bearing 5 formed by integrally laminating the lower metal plate 3, the rubber layer 11, and the upper metal plate 4 is placed on the upper surface of the base plate 2, and the lower metal plate 3 A locking projection 17 having a square cross section, which is integrally provided in the lower central portion, is fitted into the locking hole 16, and a lower slide bearing plate made of a synthetic resin such as tetrafluoroethylene is provided on the upper surface of the upper metal plate 4. 18 is fixed by an adhesive or the like.

A plurality of anchor members 19 are fixed to the upper portion of the steel sole plate 6, and a plurality of steel reaction force bearings projecting downward are provided at both ends of the sole plate 6 in the extension and contraction direction (front-back direction) of the upper structure. The walls 8 and 9 are integrally provided at intervals in the width direction (horizontal direction) of the upper structure, and the reaction force bearing walls 8 and 9 are provided in the longitudinal direction (front-back direction) of the upper structure.
Is provided with a female screw hole extending therethrough, a bolt 10 is screwed into the female screw hole of one reaction force bearing wall 8, and the other reaction force bearing wall 9 is
The bolt 20 is screwed into the female screw hole.

On the left and right sides of the lower surface of the sole plate 6, steel bearing projections 21 extending in the front-rear direction are integrally provided, and on the lower surface of the sole plate 6, an upper slide bearing plate 22 made of a stainless steel plate is provided. The upper sliding bearing plate 22 is fixed by an adhesive or the like, and the upper sliding bearing plate 22 is mounted on the lower sliding bearing plate 18 on the upper portion of the rubber bearing 5 so as to be slidable back and forth, and each reaction force bearing wall 8 on one side and the upper metal plate 4 A narrow spacer 12 is interposed between the upper and lower metal plates 4, and a wide spacer 13 is interposed between the other reaction force bearing wall 9 and the upper metal plate 4.
The spacers 12 and 13 are detachably fixed to the sole plate 6 with bolts 14.

Next, as shown in FIG. 8, concrete constituting the upper structure 7 such as an upper bridge is placed on the upper portion of the sole plate 6. At this time, a wide spacer 13 is mounted between the reaction force bearing wall 9 and the upper metal plate 4, and a narrow spacer 12 is provided between the other reaction force bearing wall 8 and the upper metal plate 4. It is installed. At this time, each bolt 1
The tips of 0 and 20 are in contact with both end surfaces of the upper metal plate 4, respectively.

After curing the concrete of the upper structure 7 for a certain period of time to make it concrete, the wide spacer 13 is removed from between the reaction force bearing wall 9 and the upper metal plate 4 as shown in FIG. The narrow spacer 12 is removed from between the force bearing wall 8 and the upper metal plate 4, and then the narrow spacer 1
2 is arranged between the reaction force bearing wall 9 and the upper metal plate 4 on the opposite side, and the bolt 1 is in contact with the reaction force bearing wall 9
Fixed to the sole plate 6 by means of 4 and the reaction force bearing wall 9
Remove the bolt 20 that is screwed into.

Next, as shown in FIG. 10, the bolt 10 screwed into the reaction force bearing wall 9 is rotated to move the upper metal plate 4 of the rubber bearing 5 in the direction opposite to the contracting direction of the upper structure. That is, the other reaction force bearing wall 9 is pushed and moved, the other end surface of the upper metal plate 4 is abutted against the narrow spacer 12, and the rubber layer 11 of the rubber bearing 5 is pre-shear-deformed.

Next, as shown in FIG. 11 and FIG.
A wide spacer 13 is interposed in the gap between the reaction force bearing wall 8 formed by the screwing of the bolt 10 and the upper metal plate 4, and the wide spacer 13 is fixed to the sole plate 6 by the bolt 14. 13 to 15 show examples of adjustable spacers 12 and 13 that can be used when the present invention is carried out, and are opposed to the front-rear surface of the reaction force bearing walls 8 and 9 in the spacer body 23. On the side surface, a plurality of adjusting plates 24A, 24B, 24C having different plate thicknesses are superposed and fixed by a countersunk screw 25, and to the spacer body 23,
A plurality of elongated holes 26 extending in the front-rear direction and a bolt head accommodating concave portion 27 surrounding the elongated holes 26 are provided, and the spacers 1 are attached by attaching and detaching the adjusting plates 24A to 24C.
The width of 2, 13 can be adjusted.

When practicing the present invention, the spacers 12, 1
For 3, various kinds of spacers whose widths cannot be adjusted may be prepared, and any spacer may be used depending on the construction situation. Further, in the present invention, after the concrete which is the upper structure 7 hardens, this concrete gradually shrinks as it dries for about one month, so when the shrinkage limit is reached, the bolt 14 Loosen, remove the wide and narrow spacers 12 and 13 from the wide and narrow gaps, and
The bolts 10 and 20 are unscrewed from the reaction force bearing walls 8 and 9.

[0013]

According to the present invention, the lower metal plate 3 in the rubber bearing 5 having the lower metal plate 3 and the upper metal plate 4 is provided on the upper surface of the metal base plate 2 fixed to the upper portion of the lower structure 1. The lower metal plate 3 is placed on the base plate 2 made of metal, the sole plate 6 is slidably placed on the upper surface of the rubber bearing 5, and the upper structure 7 Is formed between the upper metal plate 4 and the reaction force bearing walls 8 and 9 provided at both ends of the sole plate 6 located in the pre-shear deformation direction and the deformation release direction corresponding to the contraction of the concrete. A wide spacer 13 and a narrow spacer 12 are mounted in the large and small gaps, and the wide and narrow spacers 13 and 12 are attached to the bolt 1
4 is fixed to the sole plate 6, and the tips of the bolts 10 and 20 screwed into the reaction force bearing walls 8 and 9 are brought into contact with the end surface of the upper metal plate 4, and the upper structure 7 is attached to the upper portion of the sole plate 6. After the concrete is poured and the concrete is hardened, the wide and narrow spacers 13 are removed from the wide and narrow gaps, and the narrow spacer 1
3 is attached to the wide gap on the opposite side and fixed to the sole plate 6, and then the bolt 10 screwed into the reaction force bearing wall 8 on the narrow gap side is screwed, and the upper metal plate 4 is attached at its tip. By pushing to widen the narrow gap to form a wide gap, the wide spacer 13 is attached to the gap and fixed to the sole plate 6,
That is, before and after the pre-shear deformation of the rubber bearing 5, the wide width and the narrow width which are arranged in the wide and narrow gaps formed in the predesigned size between the upper metal plate 4 and the left and right reaction force bearing walls 8 and 9. After preliminarily shearing and deforming the rubber bearings 5, the spacers 12 and 13 are replaced and mounted in the wide and narrow gaps that are reversed on the left and right sides, and the reaction force bearing walls 8 and 9 and the rubber bearings 5 are mounted. Since the spacers 12 and 13 are fixedly interposed between the upper metal plate 4 and the upper metal plate 4, the upper metal plate 4 of the rubber bearing 5 is fixed so as not to move with respect to the sole plate 6 in the expansion and contraction direction of the upper structure. The amount of preliminary shear deformation of the bearing 5 can be set easily and accurately by using a strong means, and the left and right end faces of the rubber bearing 5 can be reliably fixed after the preliminary shear deformation. Further, with the above configuration, the height of the preliminary shear deformation installation device can be reduced to reduce the weight and the manufacturing cost can be reduced, and further, the appearance of the preliminary shear deformation installation device of the rubber bearing can be exhibited, and Since the sliding surface on the side of the sole plate 6 faces downward, foreign matter such as dust does not accumulate on the sliding surface, and the structure of the preliminary shear deformation installation device is simple and can be downsized. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a preliminary shear deformation installation device for a rubber bearing before construction of an upper structure.

FIG. 2 is a plan view of the pre-shear deformation installation device for the rubber bearing shown in FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a side view showing a pre-shear deformation installation device for a rubber bearing before constructing an upper structure.

FIG. 6 is a vertical sectional side view showing a part of FIG. 1 in an enlarged manner.

FIG. 7 is a vertical sectional side view showing a part of FIG. 4 in an enlarged manner.

FIG. 8 is a vertical cross-sectional side view showing a state in which an upper structure is constructed on a sole plate.

FIG. 9 is a vertical cross-sectional side view showing a state in which preparation for shear deformation of a rubber bearing is completed.

FIG. 10 is a vertical sectional side view showing a state in which the rubber bearing is sheared and deformed.

FIG. 11 is a vertical cross-sectional side view showing a state in which the rubber bearing is shear-deformed and the upper metal plate of the rubber bearing is fixed so as not to move with respect to the sole plate.

12 is a cross-sectional view taken along the line CC of FIG.

FIG. 13 is a bottom view of the adjustable spacer.

FIG. 14 is a side view showing an adjustable spacer.

FIG. 15 is an enlarged sectional view taken along line DD of FIG.

[Explanation of symbols]

 1 Lower Structure 2 Base Plate 3 Lower Metal Plate 4 Upper Metal Plate 5 Rubber Bearing 6 Sole Plate 7 Upper Structure 8 Reaction Force Bearing Wall 9 Reaction Force Bearing Wall 10 Bolt 11 Rubber Layer 12 Spacer 13 Spacer 14 Bolt 15 Anchor Member 16 Engagement Stop hole 17 Locking protrusion 18 Lower sliding bearing plate 19 Anchor member 20 Bolt 21 Bearing protruding ridge 22 Upper sliding bearing plate 23 Spacer body 24 Adjusting plate 25 Countersunk screw 26 Long hole 27 Bolt head accommodating recess

Claims (2)

(57) [Claims] 1. A lower metal plate (3) in a rubber bearing (5) having a lower metal plate (3) and an upper metal plate (4) is placed on the upper surface of a metal base plate (2) fixed to the upper part of the lower structure (1), The lower metal plate 3 is locked to the metal base plate 2, and at the both ends of the sole plate 6 slidably mounted on the upper surface of the rubber bearing 5, and when the upper structure 7 contracts concrete. Correspondingly, the large and small gaps formed between the reaction force bearing walls 8 and 9 provided at both ends of the sole plate 6 located in the pre-shear deformation direction and the deformation release direction and the upper metal plate 4 respectively have wide widths. The spacer 13 and the narrow spacer 12 are mounted, and the wide and narrow spacers 13 and 12 are attached to the sole plate 6 with the bolts 14.
The upper end of the upper metal plate 4 is abutted with the ends of the bolts 10 and 20 screwed to the reaction force bearing walls 8 and 9, and the concrete, which is the upper structure 7, is struck on the upper portion of the sole plate 6. After the concrete is hardened, the wide and narrow spacers 13 are removed from the wide and narrow gaps, and the narrow spacers 13 are mounted in the wide gaps on the opposite side of the sole plate. 6 and then, the bolt 10 screwed into the reaction force bearing wall 8 on the narrow gap side is screwed, and the upper metal plate 4 is pushed by the tip of the bolt 10 to expand the narrow gap to form a wide gap. A pre-shear deformation installation method for a rubber bearing, characterized in that a wide spacer 13 is attached and fixed to the sole plate 6, and the bolts 10 and 20 are unscrewed from the left and right reaction force bearing walls 8 and 9. 2. The lower metal plate 3 in a rubber bearing 5 having a lower metal plate 3 and an upper metal plate 4 on the upper surface of a metal base plate 2 fixed to the upper part of the lower structure 1.
Is mounted on the base plate 2 made of metal, the lower metal plate 3 is locked to the metal base plate 2, and both ends of the sole plate 6 slidably mounted on the upper surface of the rubber bearing 5 and the upper structure 7 Corresponding to the contraction of the concrete, the sole plate 6 located in the pre-shear deformation direction and the deformation release direction
The reaction force bearing walls 8 and 9 at both ends of the
A gap that widens or narrows due to the sliding of the sole plate 6 is formed between 9 and both ends of the upper metal plate 4, and the bolts 10 are attached to the wide and narrow gaps. A wide spacer 12 and a narrow spacer 13 which can be detachably fixed to the sole plate 6 by 20 are provided,
And a bolt 1 that presses both end surfaces of the upper metal plate 4 with the tip
A preliminary shearing deformation installation device characterized in that 0 and 20 are screwed into the left and right reaction force bearing walls 8 and 9.