JPH0365445B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used when a pre-sheared rubber bearing is set between a structure such as a bridge girder and a supporting structure such as a bridge ledge or abutment. This invention relates to a preliminary shear deformation holding device.

[Prior art]

When a support structure such as a bridge ledge or abutment supports a structure such as a concrete bridge girder through a rubber bearing, the supported part of the structure is susceptible to expansion and contraction of the structure due to temperature changes and drying shrinkage of the concrete structure. The rubber bearing is moved horizontally by creep, etc., and as a result, the rubber bearing is sheared and deformed in the longitudinal direction of the structure, that is, in the front-rear direction.

When the rubber bearing undergoes shear deformation, a horizontal force of the same magnitude as the shear deformation resistance force of the rubber bearing acts on the upper part of the support structure, and the shear deformation resistance force is equal to the amount of horizontal movement of the supported part of the structure, that is, the rubber It increases in proportion to the amount of shear deformation of the bearing.

If a large horizontal force acts on the upper part of the support structure, it will be uneconomical because it will be necessary to take reinforcement measures such as enlarging the cross section of the support structure. Additionally, increasing the thickness of the rubber layer in a rubber bearing can reduce the shear resistance of the rubber bearing, but increasing the thickness of the rubber layer also reduces the flat area of the rubber bearing in order to prevent a decrease in the stability of the rubber bearing. This results in a need for a larger rubber bearing, which increases the thickness and area of the rubber bearing, making it more expensive.

As a countermeasure against this, a preliminary shear deformation is applied to the rubber bearing in an amount equivalent to the amount of deformation due to drying shrinkage, creep, etc. of the concrete structure in a direction opposite to the deformation direction of the structure. As a means of applying shear, as disclosed in Japanese Patent Publication No. 52-34138, a steel groove-shaped holding member is fixed to the upper part of the support structure with bolts.
The lower steel plate of the rubber bearing is fixed to the bottom plate of the groove-shaped holding member with bolts, the bottom plate of the steel groove-shaped formwork is placed on the upper steel plate of the rubber bearing and fixed with bolts, and the groove-shaped formwork is fixed with hydraulic jacks. concrete is moved in the opposite direction to the deformation direction by a length corresponding to the amount of deformation due to drying shrinkage, creep, etc. of the concrete structure, and concrete is poured into the channel formwork,
There is a known method for removing the hydraulic jack after the concrete has undergone a curing period.

[Problem that the invention seeks to solve]

However, in the case of this method, the large groove-shaped holding member used when moving the groove-shaped formwork is left as it is without being recovered, and the reaction force support member of the hydraulic jack is held in the groove shape. Since it is necessary to fix it to a member or a supporting structure, there is a problem that the construction is complicated and the construction cost is high.

[Object and structure of the invention]

An object of the present invention is to provide a preliminary shear deformation retaining device for a rubber bearing that can advantageously solve the above-mentioned problems, and which includes a rubber bearing 3 having an upper metal plate 1 and a lower metal plate 2. The upper metal plate 1 is pre-sheared and deformed so that the upper part is displaced forward and the lower part is displaced backward, and the rear engagement protrusion 5 of the upper holding fitting 4 is engaged with the rear end of the upper metal plate 1, and the lower metal plate 2 is The front engagement protrusion 7 of the lower holding fitting 6 is engaged with the front end, and the lower holding fitting 6 is engaged with the rear of the front engagement protrusion 8 provided at the front of the upper holding fitting 4.
A rubber bearing characterized in that a rear engagement protrusion 9 is disposed at the rear of the rubber bearing, and the front engagement protrusion 8 and the rear engagement protrusion 9 are directly or indirectly engaged. The preliminary shear deformation holding device is the first
According to the present invention, a rubber bearing 3 comprising an upper metal plate 1 and a lower metal plate 2 is pre-sheared so that the upper part thereof is displaced forward and the lower part thereof is displaced rearward, and the rear end of the upper metal plate 1 is The rear engaging protrusion 5 of the upper holding fitting 4 is engaged, the front engaging protrusion 7 of the lower holding fitting 6 is engaged with the front end of the lower metal plate 2,
A rear engagement protrusion 9 provided at the rear of the lower holding metal fitting 6 is disposed at the rear of the front engagement protrusion 8 provided at the front of the upper holding metal fitting 4, and the front engagement protrusion 8 and The rear engagement protrusion 9 is directly or indirectly engaged with the lower metal plate 2 and the upper holding metal fitting 4.
A second invention provides a preliminary shear deformation holding device for a rubber bearing, characterized in that a tightening support member 10 is interposed between the upper metal plate 1 and the lower holding fitting 6, respectively. be.

〔Example〕

Next, the present invention will be explained in detail using examples shown in the drawings.

4 and 5 show the rubber bearing 3 used in the embodiment of the first invention, in which an upper locking convex portion 12 is formed on the upper surface of the rubber layer 11 and on the central upper surface.
An upper metal plate 1 made of a flat rectangular steel plate having
are fixed together, and a lower metal plate 2 made of a steel plate having a rectangular planar shape and having a lower locking protrusion 13 on the lower center surface is integrally fixed to the lower surface of the rubber layer 11, and the upper metal plate 1 and the lower The left and right side portions of the metal plate 2 protrude beyond the side surfaces of the rubber layer 11.

FIG. 6 shows separately the steel upper holding fitting 4 and the steel lower holding fitting 6 used in the embodiment of the first invention, and shows a rod extending in the front-rear direction (horizontal direction in FIG. 6). A rear engagement protrusion 5 that projects upward is integrally provided at the rear end of the rod 14, and a front engagement protrusion 8 that projects downward is integrally provided at the front end of the rod 14 to hold the upper part. A front engagement protrusion 7 that projects downward is provided at the front end of the rod 15 that is configured with the metal fitting 4 and extends in the front-rear direction.
is integrally provided, and an engagement rear protrusion 9 that protrudes upward at the rear end of the rod 15 is integrally provided to constitute the lower holding metal fitting 6.Furthermore, the engagement front protrusion 8 and the engagement The rear protrusion 9 is provided with a through hole 16 extending in the front-rear direction.

1 to 3 show a preliminary shear deformation holding device for a rubber bearing according to an embodiment of the first invention, in which the upper part of the rubber bearing 3 is deviated forward (to the left in FIG. 1). At the same time, the rubber bearing 3 is sheared and deformed so that the lower part of the rubber bearing 3 is displaced rearward (to the right in FIG. At the same time, a lower holding fitting 6 is arranged at the front upper part of the left and right sides of the lower metal plate 2, and a rear engaging protrusion 5 provided at the rear end of the upper holding fitting 4 is connected to the rear end of the upper metal plate 1. At the same time, the front engaging protrusion 7 provided at the front end of the lower holding metal plate 6 is engaged with the front end of the lower metal plate 2, and the front engaging protrusion 7 provided at the front end of the upper holding metal plate 4 is engaged with the front end of the lower metal plate 2. A rear engagement protrusion 9 provided at the rear end of the lower holding fitting 6 is disposed at the rear of the front engagement protrusion 8 .

The front engagement protrusion 8 and the rear engagement protrusion 9
A spacing adjustment plate 17 made of a plurality of steel plates is interposed between the two, and a pin or bolt 18 is inserted across the front engagement protrusion 8, the rear engagement protrusion 9, and the spacing adjustment plate 17. pin or bolt 1
8 prevents the separation of the interval adjustment plate 17 and connects the upper holding metal fitting 4 and the lower holding metal fitting 6 so as not to bend, thereby preventing the separation of the rear engagement protrusion 5 from the upper metal plate 1 and the lower metal plate 2. The front engaging protrusion 7 is prevented from detaching from the front engaging protrusion 7.

When applying preliminary shear deformation to the rubber bearing 3 and holding it in that state, first, as shown in Fig. 7,
The lower metal plate 2 of the rubber bearing 3 is placed on the upper surface of the steel pedestal 21 having the jack reaction force bearing part 19 and the locking recess 20, and the lower locking convex part 13 of the lower metal plate 2 is placed on the pedestal. 21, and place the steel pressing plate 22 on the upper metal plate 1 of the rubber bearing 3, and the upper locking protrusion 12 of the upper metal plate 1 is engaged with the pressing plate 22. A presser member 25 is fitted into the stopper recess 23 and placed on the press plate 22 via a plurality of rod-shaped rollers 24 extending in the left-right direction, and a load P is applied to the presser member 25.

Next, the hydraulic jack 26 engaged with the jack reaction force support portion 19 presses and moves the press plate 22 forward, and the press plate 22 moves the upper metal plate 1 forward, so that it is attached to the rubber support 3. Give the required amount of pre-shear deformation.

Next, as shown in FIGS. 1 to 3, preliminary shear deformation holding devices are set on both left and right sides of the rubber bearing 3 that has been sheared deformed, and then the hydraulic jack 26 is shortened, and then the presser member 25, The rod-shaped roller 24, the pedestal 21, and the press plate 22 are removed.

Next, the rubber bearing 3 held in the pre-shear deformation state by the pre-shear deformation holding device is transported to the structure erection site, and as shown in FIG. The lower metal plate 2 of the rubber bearing 3 is placed on the steel lower support plate 29 with the anchor member 28 fixed to the lower metal plate 2, and the lower locking convex portion 13 of the lower metal plate 2 is placed on the lower locking convex portion 13 of the lower support plate 29. The steel upper support plate 32 that has been fitted into the locking recess 30 and has the anchor member 31 fixed thereto is placed on the upper metal plate 1 of the rubber support 3, and the upper locking protrusion 12 of the upper metal plate 1 is placed on the upper metal plate 1 of the rubber bearing 3. It fits into the upper locking recess 33 of the upper support plate 32.

Next, a formwork (not shown) constituting a structure 34 such as a bridge girder is placed, concrete is poured into it, and after the concrete has had a curing period, the pins or bolts 18 are removed. Then, the upper holding fitting 4 and the lower holding fitting 6 are removed to obtain the state shown in FIG. 9.

10 to 12 show a first embodiment of the second invention, in which a nut 37 is screwed into a screw rod 36 to which a seat plate 35 is fixed to one end, and the screw rod 36 is screwed onto the nut 37. The support cylinder part 38 that accommodates the protruding end is fixed by welding to constitute the tightening support member 10, and the tightening support member 10 is located between the lower metal plate 2 and the upper holding fitting 4 and between the upper metal plate 1. and the lower holding fitting 6, and the upper holding fitting 4 is pressed against the upper metal plate 1 by the tightening force of the tightening support member 10, and the lower holding fitting 6 is pressed against the lower metal plate 2, The configuration is such that the rear engagement protrusion 5 is prevented from detaching from the upper metal plate 1 and the front engagement protrusion 7 is prevented from detachment from the lower metal plate 2, but the other configurations are similar to the embodiment of the first invention. The same is true for .

FIG. 13 shows a second embodiment of the second invention, in which the tightening support member 1 is constructed as described above.
0 is interposed between the lower metal plate 2 and the upper holding metal fitting 4 and between the upper metal plate 1 and the lower holding metal fitting 6, and the front engagement protrusion 8 and the rear engagement protrusion 9 are directly engaged with each other. The front engagement protrusion 8 and the rear engagement protrusion 9 are not connected by pins or bolts, but the other configurations are the same as in the embodiment of the first invention.

In the case of both embodiments of the second invention, after the curing period of the concrete structure on the pre-sheared rubber bearing 3 has elapsed, the nut 37 is rotated in the loosening direction to shorten the tightened bearing member 10. After that, the tightening support member 10 may be removed, or the threaded rod 36 may be fused and the tightening support member 10 may be removed.

〔Effect of the invention〕

According to the present invention, the rubber bearing 3 including the upper metal plate 1 and the lower metal plate 2 is pre-sheared so that the upper part thereof is displaced forward and the lower part thereof is displaced backward, and The rear engaging protrusion 5 of the upper holding fitting 4 is engaged with the end, and the lower metal plate 2
A front engaging protrusion 7 of the lower holding fitting 6 is engaged with the front end of the lower holding fitting 6, and a front engaging protrusion 8 provided at the front of the upper holding fitting 4 is engaged with a front engaging protrusion 7 provided at the rear of the lower holding fitting 6. Since the rear engagement protrusion 9 is disposed, and the front engagement protrusion 8 and the rear engagement protrusion 9 are directly or indirectly engaged, it is possible to create a compact and lightweight spare with an extremely simple structure. The shear deformation holding device holds the rubber bearing 3 in a preliminary shear deformation state, and the rubber bearing 3 can be transported to the structure erection site, and the support structure 27 can hold the rubber bearing 3 in a pre-sheared deformed state, and the support structure 27 can transfer the rubber bearing 3 to the structure 34 via the rubber bearing 3. After supporting the upper holding fitting 4 and the lower holding fitting 6, the upper holding fitting 4 and the lower holding fitting 6 can be easily removed by disengaging the engagement front projection 8 of the upper holding fitting 4 and the engagement rear projection 9 of the lower holding fitting 6. It is economical because it can be removed and reused at any time, and furthermore, after the rubber bearing 3 that has been pre-sheared and deformed is placed on the support structure 27 and the structure 34 is constructed on top of the rubber bearing 3, Construction is easy because it is only necessary to remove the preliminary shear deformation holding device.
Furthermore, by interposing the tightening support member 10 between the lower metal plate 2 and the upper holding metal fitting 4 and between the upper metal plate 1 and the lower holding fitting 6, the upper holding metal fitting 4 can be Rear engaging protrusion 5
It is possible to reliably prevent the front engagement protrusion 7 of the lower holding fitting 6 from coming off the upper metal plate 1 and the lower metal plate 2 from coming off.

[Brief explanation of drawings]

Figures 1 to 6 show an embodiment of the first invention, in which Figure 1 is a side view of a rubber bearing preliminary shear deformation holding device, and Figure 2 is a partially enlarged view. 3 is a plan view of the preliminary shear deformation holding device for the rubber bearing, 4 is a perspective view of the rubber bearing, 5 is a front view thereof, and 6 is a view of the upper and lower holding fittings. It is a perspective view separated and shown. Fig. 7 is a partially longitudinal side view showing a state in which preliminary shear is applied to the rubber bearing, and Fig. 8 shows the rubber bearing held in the preliminary shear deformation state by the preliminary shear deformation holding device on top of the support structure. FIG. 9 is a vertical side view showing the set state, and FIG. 9 is a vertical side view showing the state in which the structure is supported by the rubber bearing which has been subjected to preliminary shear deformation. Figures 10 to 1
2 shows a first embodiment of the second invention, in which FIG. 10 is a side view of a preliminary shear deformation holding device for a rubber bearing, FIG. 11 is a perspective view of a tightening support member,
FIG. 12 is a longitudinal sectional side view thereof. FIG. 13 is a side view of a preliminary shear deformation holding device according to a second embodiment of the second invention. In the figure, 1 is an upper metal plate, 2 is a lower metal plate, 3 is a rubber bearing, 4 is an upper holding metal fitting, 5 is a rear engaging protrusion, 6 is a lower holding metal fitting, 7 is a front engaging protrusion, and 8 is an engaging metal plate. 9 is a rear projection for engagement; 10 is a tightening support member; 11 is a rubber layer; 12 is an upper locking projection; 13 is a lower locking projection; 17 is a spacing adjustment plate; 18 is a Pin or bolt, 21 is a steel pedestal, 22 is a steel press plate, 24 is a rod-shaped roller, 25
is a holding member, 26 is a hydraulic jack, 27 is a support structure, 29 is a steel lower support plate, 30 is a lower locking recess, 32 is a steel upper support plate, 33 is an upper locking recess, and 34 is a structure , 35 is the seat plate, 36 is the screw rod, 3
7 is a nut, and 38 is a supporting cylinder.

Claims (1)

[Claims] 1. A rubber bearing 3 having an upper metal plate 1 and a lower metal plate 2 is pre-sheared so that the upper part thereof is displaced forward and the lower part thereof is displaced backward, and the upper metal plate 1 is The rear engaging protrusion 5 of the upper holding fitting 4 is engaged with the rear end, the front engaging protrusion 7 of the lower holding fitting 6 is engaged with the front end of the lower metal plate 2, and the front of the upper holding fitting 4 is engaged. Engagement front protrusion 8 provided in
A rear engagement projection 9 provided at the rear of the lower holding metal fitting 6 is disposed at the rear of the lower holding fitting 6, and the front engagement projection 8 and the rear engagement projection 9 are engaged directly or indirectly. A rubber bearing preliminary shear deformation holding device characterized by: 2 The rubber bearing 3, which includes the upper metal plate 1 and the lower metal plate 2, is pre-sheared so that the upper part is displaced forward and the lower part is displaced backward, and the upper part is held at the rear end of the upper metal plate 1. The rear engaging protrusion 5 of the metal fitting 4 is engaged, the front engaging protrusion 7 of the lower holding fitting 6 is engaged with the front end of the lower metal plate 2, and the engaging protrusion 7 provided at the front of the upper holding fitting 4 is engaged with the front end of the lower metal plate 2. Front protrusion 8
An engagement rear protrusion 9 provided at the rear of the lower holding metal fitting 6 is disposed at the rear of the lower holding fitting 6, and the engagement front protrusion 8 and the engagement rear protrusion 9 are engaged directly or indirectly, and the lower Between the metal plate 2 and the upper holding fitting 4 and between the upper metal plate 1 and the lower holding fitting 6,
A preliminary shear deformation holding device for a rubber bearing, characterized in that a tightening support member 10 is interposed in each case.