JPH0577803B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention aims to reduce the amount of shear deformation of a rubber bearing that supports a concrete superstructure such as a bridge girder. This relates to a method of hemming the upper structure by moving the lower part of the rubber support in the direction of contraction of the upper structure.

(Prior art) Conventionally, as a method for attaching a sliding hem to a rubber bearing for a structure, the method published in Japanese Patent Publication No. 58-41365, that is, a flat steel plate fixed to the upper part of a substructure. A recess is provided on the upper surface of the support plate body at the middle part in the direction of contraction of the superstructure, and a sliding plate with a low friction coefficient is fitted and fixed in the recess, and a sliding suppressing part is provided on the upper surface of the end in the direction of contraction of the superstructure. A concrete superstructure is placed on the sliding plate via a rubber bearing, and then horizontal movement of the support due to contraction of the superstructure causes the rubber bearing to slide. A method is known in which the slider is slid to the vicinity where it hits the restraint part.

(Problems to be Solved by the Invention) However, in the case of the conventional sliding hem direction, when the rubber bearing slides due to contraction of the upper structure, the frictional resistance between the sliding plate and the lower surface of the rubber bearing causes the rubber The rubber layer of the bearing undergoes shear deformation, and in this state, the lower part of the rubber bearing hits the sliding suppression part, and then the upper structure contracts further. Since it is added to the amount of shear deformation, the amount of shear deformation of the rubber layer becomes considerably large. When the amount of shear deformation of the rubber layer becomes large, it is necessary to make the rubber layer thicker and reduce the shear deformation angle, which is uneconomical.

In addition, in the case of the conventional sliding hem method, the rubber bearing slides due to contraction of the upper structure and hits the sliding suppression part, and then the rubber bearing moves on the sliding plate in the opposite direction to the contraction direction of the upper structure. Since it can slide in any direction, there is a problem that it is unstable against horizontal forces such as horizontal seismic forces.

(Object and Structure of the Invention) An object of the present invention is to provide a sliding hem method for a rubber bearing for a structure that can advantageously solve the above-mentioned problems, and the gist of the present invention is as follows: A lower support plate 4 connected to the lower part of the rubber bearing 3 is placed on the upper surface of the base plate 2 fixed to the upper part of the lower structure 1 so as to be able to slide freely in the longitudinal direction of the upper structure. A split locking member 8 consisting of an upper locking member 6 and a lower locking member 7 is moved downwardly onto the combined upper support plate 5 and the lower support plate 4 on both sides in a direction perpendicular to the longitudinal direction of the upper structure. The locking member 8 is placed on the base plate 2, and the upper locking member 6 is engaged with the lower locking member 7 so as not to move relative to the lower locking member 7 in the direction of contraction of the upper structure. The rubber bearing 3, the lower support plate 4, the upper support plate 5, and the locking member 8 are moved by contraction of the concrete superstructure 9 whose end is fixed to the upper part of the support plate 5, and then the jack 10 By moving the lower support plate 4 and the lower locking member 7 in the upper structure contraction direction via the pressing jig 11, the lower locking member 7 is moved downward while fitted to the lower support plate 4. , the lower locking member 7 is fitted into the locking member drop-fitting locking hole 12 in the base plate 2, and the upper locking member 6 is moved downward to be separated from the upper support plate 5. There is a sliding hem method for rubber bearings for structures.

(Example) Next, the present invention will be explained in detail using an example shown in the drawings.

Figures 10 to 13 show a split type steel locking member used in an embodiment of the present invention, in which the lower locking member is arranged to extend in the longitudinal direction of the upper structure, that is, in the front-rear direction. Part body 1
A protrusion 14 extending in the front-rear direction is integrally connected to the front part of the upper part of 3, and the protrusion 14
A long hole 15 extending in the front-rear direction is provided in the lower locking member 7.

Also, the upper locking member main body 16 extends in the front and back direction.
An engagement groove 17 extending in the front-rear direction is provided in the front portion of the lower part of the upper locking member 6, and an engagement groove 17 in the upper locking member 6 is provided in the protrusion 14 of the lower locking member 7. 17 are fitted, and a separation prevention pin 18 is inserted between the front part of the elongated hole 15 and the upper locking member 6, and both ends of the pin 18 are fixed to the upper locking member 6 by caulking. has been done.

When the upper locking member 6 is moved by applying a pressing force in the upper structure contraction direction, that is, in the direction of arrow (A), the lower locking member 7 is moved due to the engagement between the protrusion 14 and the rear part of the upper locking member 6. is also moved, and when a pressing force is applied to the lower locking member 7 in the direction of upper structure contraction while holding the upper locking member 6 so as not to move, only the lower locking member 7 is caused to contract. can move in the direction.

14 to 16 show a pressing jig 11 used in an embodiment of the present invention, in which a steel band-shaped pressing plate is arranged to extend in a direction perpendicular to the longitudinal direction of the superstructure. A rear end portion of a steel traction member 20 arranged to extend in the longitudinal direction of the superstructure is placed on the upper surface of both ends of the superstructure member 19,
The engagement protrusion 21 connected to the rear end of the traction member 20 is engaged with the rear surface of the pressing plate 19, and the connecting bolt 22 inserted through the rear end of the steel traction member 20 is connected to the pressing plate 19. 19, and a jack supporting arm 23 is integrally connected to the side of the front end of the steel traction member 20.

Next, a method for sliding hemming of a rubber bearing according to an embodiment of the present invention using the split locking member 8 and the pressing jig 11 will be described.

Figures 1 to 4 show the state in which the preparation for sliding hem of the rubber bearing is completed, and the steel base plate 2 is placed on the upper part of the concrete substructure 1.
is arranged, and a locking hole 12 for fitting a locking member is provided on both sides of the base plate 2 in a direction perpendicular to the longitudinal direction of the upper structure, that is, in the left-right direction, and a locking hole 12 for fitting the locking member is provided outside the locking hole 12. A steel guide member 24 extending in the longitudinal direction of the object, that is, the front-rear direction, is fixed by welding, and a protrusion 25 extending in the front-rear direction is provided on the upper side surface of the guide member 24, and a locking hole is provided in the lower surface of the base plate 2. Steel plate cover plate 2 that closes the lower part of 12
6 is fixed by welding or adhesive, a lower sliding plate 27 made of a stainless steel plate is fixed to the upper surface of the base plate 2 by welding or adhesive, and the base plate 2 is fixed to the lower structure 1 by anchor bolts 28. There is.

An upper sliding plate 29 made of a synthetic resin plate such as tetrafluoroethylene is fixed to the lower surface of the steel lower support plate 4 with adhesive or the like, and the upper sliding plate 29 is placed on the lower sliding plate 27, and the rubber An upper metal plate 31 and a lower metal plate 32 are integrally fixed to the upper and lower surfaces of the layer 30, and an upper engagement protrusion 33 is integrally provided at the center of the upper surface of the upper metal plate 31. A lower engaging protrusion 34 is integrally provided in the center of the rubber bearing 3.

The lower metal plate 32 of the rubber bearing 3 is placed on the lower support plate 4, and the lower engagement protrusion 34 is fitted into the lower engagement hole 35 provided at the center of the lower support plate 4, and the lower metal plate 32 is inserted into the upper part. The steel upper support plate 5 to which a large number of steel anchor members 36 are fixed is placed on the upper metal plate 31, and the upper engagement protrusion is inserted into the upper engagement hole 37 provided in the center of the upper support plate 5. 33 is fitted, and furthermore, a steel cover plate 38 that closes the upper part of the upper engagement hole 37 is provided on the upper surface of the upper support plate 5.
are fixed by welding or adhesive.

An upper engagement recess 39 and a lower engagement recess 40 are provided on both sides of the upper support plate 5 and the lower support plate 4 in a direction perpendicular to the longitudinal direction of the upper structure, that is, in the left and right direction, and on both left and right sides of the rubber support 3. The upper locking member 6 of the dispersion type locking member 8 arranged is fitted into the upper engaging recess 39 so as not to move in the front-rear direction but to be able to move downward. The lower locking member 7 is fitted into the lower engagement recess 40 so as not to move in the front-rear direction and to be able to move downward, and is placed on the lower sliding plate 27, and further The distance L between the end of the locking member 7 on the middle side of the superstructure and the end of the locking hole 12 on the middle side of the superstructure is determined by the amount of drying shrinkage of the concrete superstructure 9 and the amount of shrinkage due to the introduction of prestress. , is set to about 80 to 90% of the total amount of shrinkage due to cleavage, that is, the total amount of shrinkage considering aging shrinkage. Further, a steel jack support member 41 is fixed to the upper surface of the left and right sides of the base plate 2 by welding.

Next, concrete constituting the structure 9 is placed, and the ends of the superstructure 9 are joined to the upper support plate 5, and the superstructure 9 shrinks due to drying and is prestressed. and shrinkage due to creep. When the structure 9 contracts, the upper support plate 5, rubber bearing 3, lower support plate 4, and locking member 8 are also moved in the longitudinal direction of the upper structure. As shown in Fig. 5, the amount of movement is about 80, which is the sum of the amount of drying shrinkage of the superstructure 9, the amount of shrinkage due to prestress introduction, and the amount of shrinkage due to creep.
~90%, as shown in FIGS. 6 and 7, the pulling member 20 of the pressing jig 11 is placed between the protrusion 25 of the guide member 24 and the upper surface of the base plate 2 The pressing plate 19 in the pressing jig 11 is arranged so as to contact or be close to the rear end surface (the end surface on the opposite side of the upper structure contraction direction) of the lower support plate 4.

Next, a hydraulic jack 10 is interposed between the jack supporting arm 23 of the pressing jig 11 and the jack supporting member 41 on the base plate, and the jack 10 moves the pressing jig 11 in the upper structure contraction direction. At the same time, the pressing jig 11 moves the lower locking member 7 via the lower support plate 4 in the direction of contraction of the upper structure. In this way, the lower part of the rubber layer 30 is sheared and deformed so as to be deviated toward the middle side of the upper structure, and the entire bottom surface of the lower locking member 7 reaches the upper part of the locking hole 12 in the base plate 2. When the second
As shown in the figure, the lower locking member 7 automatically descends and fits into the front locking hole 12, and the lower support plate 4
is coupled to the base plate 2 so as not to move in the front-rear direction, and the upper locking member 6 automatically descends and disengages from the upper engagement recess 39 in the upper support plate 5.

After the lower locking member 7 is fitted into the locking hole 12, the jack 10 and the pressing jig 11 are removed. Next, when the upper structure 9 shrinks to about 100% of the total amount of shrinkage due to drying shrinkage, shrinkage due to prestress introduction, and creep, the rubber layer 30
The amount of shear deformation becomes almost zero.

When carrying out the present invention, as shown in FIG. The metal plate 31 and the lower metal plate 32 may be omitted. Further, a synthetic resin plate may be used in place of the lower sliding plate 27, or the lower sliding plate 27 may be omitted and the upper surface of the base plate 2 may be coated with grease. Furthermore, the elongated hole 15 and separation prevention pin 18 in the locking member 8 may be omitted.

(Effects of the Invention) According to the present invention, the lower support plate 4 connected to the lower part of the rubber support 3 can be slid and moved in the longitudinal direction of the upper structure on the upper surface of the base plate 2 fixed to the upper part of the lower structure 1. an upper support plate 5 and the lower support plate 4 placed on the rubber support 3 and connected to the upper part of the rubber support 3;
A split locking member 8 consisting of an upper locking member 6 and a lower locking member 7 is fitted on both sides of the upper structure in a direction perpendicular to the longitudinal direction of the upper structure so as to be movable downward, and the locking member 8 is The base plate 2
The rubber bearing 3, the lower support plate 4, the upper support plate 5, and the locking member 8 are compressed by the contraction of the concrete upper structure 9, which is placed on the upper support plate 5 and whose end is fixed to the upper part of the upper support plate 5. Since the concrete superstructure 9 is moved, the rubber bearings 3
A lower support plate 4 and an upper support plate 5 connected to the lower and upper parts of the upper structure are connected by a locking member 8 so as not to move relatively in the longitudinal direction of the upper structure,
Shear deformation of the rubber layer 30 in the rubber bearing 3 due to contraction of the upper structure 9 can be prevented, and after the contraction of the upper structure 9 approaches the end,
The jack 10 moves the lower support plate 4, the lower locking member 7, and the lower part of the rubber layer 30 by an amount approximately equal to the amount of remaining contraction of the upper structure 9 through the pressing jig 11. The locking member 7 is moved downward while fitted to the lower support plate 4, and the lower locking member 7 is dropped into the locking member drop-fitting locking hole 12 in the base plate 2, and the upper locking member 7 is moved downwardly. Since the member 6 is moved downward and separated from the upper support plate 5, the amount of shear deformation of the rubber layer 30 in the rubber bearing 3 is reduced when the drying shrinkage of the upper structure 9, the shrinkage due to the introduction of prestress, and the shrinkage due to creep are completed. becomes almost zero, which makes it possible to reduce the thickness of the rubber layer 30, which is economical.Furthermore, when the contraction of the upper structure 9 is completed, the rubber support 3 is attached to the base plate by the lower locking members 7. Effects such as being able to hem in a stable state so that it does not shift relative to 2, and freely allowing expansion and contraction of the upper structure 9 due to changes in temperature can be obtained.

[Brief explanation of the drawing]

1 to 9 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional front view showing a state in which preparations for sliding installation on a lower structure have been completed;
Figure 2 is a plan view, Figure 3 is a side view of the sliding installation device that has completed preparations for sliding installation, Figure 4 is a sectional view taken along line A-A in Figure 2, and Figure 5 shows the contraction of the superstructure. FIG. 6 is a partially longitudinal side view showing the relationship between the locking member and other parts when it approaches the end; FIG. The figure is a side view, FIG. 8 is a partially longitudinal side view showing the lower locking member inserted into the locking hole of the base plate and the upper locking member removed from the upper support plate, and FIG. 9 is the upper part. FIG. 6 is a partially longitudinal side view showing the state of each part when the structure has finished shrinking. 10 to 13 show a split type locking member used in an embodiment of the present invention, in which FIG. 10 is a side view and FIG. 11 is a sectional view taken along the line B-B in FIG. 10. , FIG. 12 is a sectional view taken along the line CC in FIG. 11, and FIG. 13 is a longitudinal sectional front view. 14 to 16 show the pressing jig used in the embodiment of the present invention, in which FIG. 14 is a plan view, FIG. 15 is a front view, and FIG. 16 is the D shown in FIG. 14. -D line sectional view. FIG. 17 is a longitudinal sectional front view showing an example in which the lower support plate and the upper support plate are integrally connected to the rubber layer. 1: Lower structure, 2: Base plate, 3: Rubber bearing, 4: Lower support plate, 5: Upper support plate, 6:
Upper locking member, 7: Lower locking member, 8: Locking member, 9: Concrete upper structure, 10: Jack, 11: Pressing jig, 12: Locking hole for fitting by dropping the locking member, 14: Projection, 15: Long hole, 1
7: Engagement groove, 18: Separation prevention pin, 19: Steel band-shaped pressure plate, 20: Steel traction member, 21: Engagement projection, 22: Connection bolt, 23: Jack support arm, 24: Steel Made guide member, 25: Projection, 2
7: Lower sliding plate, 28: Anchor bolt, 29:
Upper sliding plate, 30: rubber layer, 31: upper metal plate,
32: Lower metal plate, 33: Upper engaging protrusion, 34:
Lower engagement projection, 35: Lower engagement hole, 37: Upper engagement hole, 39: Upper engagement recess, 40: Lower engagement recess, 41: Steel jack support member.

Claims (1)

[Claims] 1. On the upper surface of the base plate 2 fixed to the upper part of the lower structure 1, a lower support plate 4 connected to the lower part of the rubber bearing 3 is placed so as to be slidable in the longitudinal direction of the upper structure, and the upper part of the rubber support 3 A split-type locking member 8 consisting of an upper locking member 6 and a lower locking member 7 is lowered onto the upper support plate 5 and the lower support plate 4 that are connected to the upper support plate 5 and the lower support plate 4 on both sides in a direction perpendicular to the longitudinal direction of the superstructure. The locking member 8 is movably fitted.
is placed on the base plate 2, the upper locking member 6 is engaged with the lower locking member 7 so as not to move relative to the upper structure contraction direction, and the end portion is fixed to the upper part of the upper support plate 5. The rubber bearing 3, the lower support plate 4, the upper support plate 5, and the locking member 8 are moved by the contraction of the concrete upper structure 9, and then the pressing jig 1 is moved by the jack 10.
By moving the lower support plate 4 and the lower locking member 7 in the upper structure contraction direction via the lower support plate 4, the lower locking member 7 is moved downwardly while being fitted to the lower support plate 4, and the lower part A structure characterized in that the locking member 7 is dropped into the locking member drop-fitting locking hole 12 in the base plate 2, and the upper locking member 6 is moved downward and separated from the upper support plate 5. How to install sliding rubber bearings.