JPH0364005B2 - - 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 support structure such as a bridge pier or abutment. This invention relates to a preliminary shear deformation holding device.

[Prior art]

When a structure such as a concrete bridge girder is supported by a support structure such as a bridge pier or abutment via a rubber bearing, the supported part of the structure is susceptible to expansion and contraction of the structure due to temperature changes, drying shrinkage of the concrete structure, etc. It moves horizontally due to creep or the like, 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. Also, by increasing the thickness of the rubber layer in a rubber bearing, the shear resistance of the rubber bearing can be reduced, but if the thickness of the rubber layer is increased, the flat area of the rubber bearing is It becomes necessary to increase the rubber bearing, which increases the thickness and planar area of the rubber bearing, making the rubber bearing 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]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pre-shear deformation retaining device for a rubber bearing which can advantageously solve the above-mentioned problems, and has a structure in which the upper part is deviated forward and the lower part is deviated rearward. A metal front support member 2 and a metal rear support member 3 are arranged at the front and rear parts of the rubber bearing 1 which has been subjected to preliminary shear deformation, and the front end of the lower metal plate 4 in the rubber bearing 1 is connected to the front support member 2 The rear end of the upper metal plate 5 of the rubber bearing 1 is engaged with the rear support member 3, and the front support member 2 is connected to the rubber bearing 1 through metal connecting members 6 disposed on both left and right sides of the rubber bearing 1. Pre-shearing deformation of a rubber bearing characterized in that both ends of the rear support member 3 are connected, and at least one end of the front support member 2 and the rear support member 3 and the connection member 6 are configured to be separable. The gist is a holding device.

〔Example〕

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

1 to 4 show the state of use of the preliminary shear deformation holding device according to the first embodiment of the present invention,
FIG. 5 shows the rubber bearing used in the first embodiment, in which a lower metal plate 4 made of a steel plate having a lower locking protrusion 9 on the lower center surface is integrally fixed to the lower surface of the rubber layer 8. Moreover, an upper metal plate 5 made of a steel plate having an upper locking protrusion 10 on the upper center surface is integrally fixed to the upper surface of the rubber layer 8, so that the flat surface 4
A corner rubber bearing 1 is constructed, and the rubber bearing 1 is
The upper part is sheared and deformed so that it is displaced forward (to the left in Figure 1) and the lower part is displaced to the rear (to the right in Figure 1). A metal front support member 2 consisting of a face plate 12 and a number of ribs 13 arranged and fixed between them is disposed, and at the rear of the rubber support 1 are a lower face plate 14, an upper face plate 15 and their A metal rear support member 3 is arranged, consisting of a number of ribs 16 arranged and fixed therebetween.

The front end of the lower metal plate 4 in the rubber bearing 1 is engaged with the rear end of the lower plate 11 in the metal front support member 2, and the rear end of the upper metal plate 5 in the rubber bearing 1 is engaged with the rear end of the lower metal plate 5 in the metal rear support member 2. Top plate 1 in 3
A metal connecting member 6 made of a steel plate and extending in the front-rear direction is disposed on both left and right sides of the rubber bearing 1 and is engaged with the front end of the metal front support member 2.
and the bottom plate 1 of the metal rear support member 3
Both ends of the upper plates 12 and 15 of the metal front support member 2 and the metal lower support member 3 are engaged with the lower locking protrusion 17 of the metal connecting member 6, and both ends of the upper plates 12 and 15 of the metal front support member 2 and the metal lower support member 3 are It is engaged with the upper locking projection 18 of the metal connecting member 6, and both ends of each metal connecting member 6 are connected by bolts 19 inserted across them.

The lower surface of the lower metal plate 4 in the rubber bearing 1 is arranged at a slightly lower level than the lower surfaces of the metal front support member 2, the metal rear support member 3, and the metal connection member 6, and the upper surface of the rubber support 1 The upper surface of the metal plate 5 is arranged at a slightly higher level than the upper surfaces of the metal front support member 2, the metal rear support member 3, and the metal connection member 6, and the lower surface plate 11 of the metal front support member 2 And the detachment prevention protrusion 20 provided at the rear center of the top plate 12 is
The lower metal plate 4 and the upper metal plate 5 of the rubber bearing 1 are arranged in a recess 21 provided in the center of the front part, and the lower surface plate 1 of the metal rear support member 3
A detachment prevention protrusion 22 provided at the center of the front portions of the rubber bearing 1 and the upper metal plate 15 is disposed in a recess 23 provided at the center of the rear portions of the lower metal plate 4 and the upper metal plate 5 of the rubber bearing 1.

When applying preliminary shear deformation to the rubber bearing 1 and holding the rubber bearing 1 by the preliminary shear deformation holding device of the present invention, first, as shown in FIG. 25, the lower metal plate 4 of the rubber bearing 1 is placed on the upper surface of the steel pedestal 26, and the lower locking protrusion 9 of the lower metal plate 4 is fitted into the locking recess 25 of the pedestal 26. Then, the steel pressing plate 27 is placed on the upper metal plate 5 of the rubber bearing 1, and the upper locking protrusion 10 of the upper metal plate 5 is fitted into the upper locking recess 28 of the pressing plate 27, and the pressing A pressing member 30 is attached to the plate 27 via a plurality of rod-shaped rollers 29 extending in the left-right direction.
is placed, and a load P is applied to the holding member 30.

Next, the hydraulic jack 31 engaged with the jack reaction force support portion 24 presses and moves the press plate 27 forward, and the press plate 27 moves the upper metal plate 5 forward, so that it is attached to the rubber support 1. Give the required amount of pre-shear deformation.

Next, as shown in FIGS. 1 to 4, the preliminary shear deformation retaining device of the present invention is set around the sheared rubber bearing 1, and then the hydraulic jack 31 is shortened, and then the presser Member 30
and the rod-shaped roller 29 is removed.

Next, the rubber bearing 1 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 4 of the rubber bearing 1 is placed on the steel lower support plate 34 with the anchor member 33 fixed to the lower metal plate 4, and the lower locking protrusion 9 of the lower metal plate 4 is locked to the lower part of the lower support plate 34. A steel upper support plate 3 that fits into the recess 25 and has an anchor member 35 fixed thereto.
6 is placed on the upper metal plate 5 of the rubber support 1, and the upper locking protrusion 10 of the upper metal plate 5 is fitted into the upper locking recess 28 of the upper support plate 36.

Next, a formwork (not shown) constituting a structure 37 such as a bridge girder is placed, concrete is poured into it, and after a curing period for the concrete has elapsed, the bolts 19 are removed. As shown in FIG. 8, between the ends of the left and right metal connecting members 6,
The jack 38 is interposed or the jack 38
and a spacer 39, and the jack 38
The lower locking protrusion 17 and the upper locking protrusion 18 of the front support member 2 or the rear support member 3 and the metal connection member 6 are moved by moving the ends of each metal connection member 6 in a direction away from each other. is disengaged, and then the pre-shear retention device is removed from around the rubber bearing 1, resulting in the condition shown in FIG.

In the case of the first embodiment, the rubber bearing is subjected to preliminary shear deformation so that the upper part of the rubber bearing 1 is deviated forward and the lower part of the rubber bearing is deviated rearward, so that the front end of the lower metal plate 4 is The rear end of the lower plate 11 of the metal front support member 2 is engaged with the upper metal plate 5, and the front end of the upper plate 15 of the metal rear support member 3 is engaged with the rear end of the upper metal plate 5. However, if, on the contrary, the rubber bearing is pre-sheared so that the upper part of the rubber bearing 1 is displaced backward and the lower part of the rubber bearing is displaced forward, the rear end of the lower metal plate 4 The front end of the lower plate 14 of the metal rear support member 3 engages with the front end of the upper metal plate 5, and the upper plate 1 of the metal front support member 2 engages with the front end of the upper metal plate 5.
The rear ends of 2 are engaged.

10 to 12 show a second embodiment of the present invention, which prevents separation between the front and rear parts of the rubber bearing 1 and the metal front support member 2 and metal rear support member 3. The means is omitted, and instead, detachment prevention protrusions 20 are provided integrally at the upper and lower portions of the intermediate portions of each metal connecting member 6.
A detachment prevention means is arranged in the recesses 21 provided on both left and right sides of the lower metal plate 4 and the upper metal plate 5 in the rubber bearing 1, but the other configuration is the same as in the first embodiment. It is.

FIG. 13 shows a third embodiment of the present invention, in which the bolts 19 in the first embodiment are omitted, and each metal connecting member 6 and the metal front support member 2 are omitted.
and the metal rear support member 3 are joined by tack welding 40, but the other configurations are the same as in the first embodiment.

In the case of the third embodiment, after constructing the structure, the ends of each metal connecting member 6 are pushed open with jacks to destroy the tacking solution, and then the metal front support member 2 and the metal rear support are The member 3 and the metal connecting member 6 are removed from around the rubber bearing 1.

When carrying out the present invention, the rubber bearing 1 includes:
A metal plate or other elongation suppressing material may be integrally interposed in the middle of the rubber layer 8 in the thickness direction to suppress the elongation of the rubber layer in the horizontal direction. The planar shape of the protrusion 9 and the upper locking protrusion 10 may be circular, square, or any other arbitrary shape.Furthermore, the metal front support 2 and the metal rear support 3 may be made of steel. preferable.

〔Effect of the invention〕

According to the present invention, a metal front support member 2 and a metal rear support member are provided at the front and rear parts of the rubber bearing 1, which is pre-sheared so that the upper part is deviated forward and the lower part is deviated rearward. 3 is arranged, the front end of the lower metal plate 4 in the rubber bearing 1 is engaged with the front support member 2, the rear end of the upper metal plate 5 in the rubber bearing 1 is engaged with the rear support member 3, and the rubber Both ends of the front support member 2 and the rear support member 3 are connected via metal connection members 6 arranged on both left and right sides of the support 1, and connected to at least one end of the front support member 2 and the rear support member 3. Since it is configured to be separable from the member 6, the rubber bearing 1 is held in a preliminary shear deformation state by a small, lightweight preliminary shear deformation holding device that surrounds the rubber bearing 1, and the rubber bearing 1 is structurally After the object can be transported to the construction site and the structure 37 is supported by the support structure 32 via the rubber bearing 1, the metal front support member 2, the metal rear support member 3 and the metal connection member are assembled. 6 can be separated from the rubber bearing 1 and removed from around the rubber bearing 1, which is economical because the pre-shear deformation retaining device can be recovered and reused. After installing the structure 37 on the support structure 32 and constructing the structure 37 on top of the rubber support 1, it is only necessary to remove the preliminary shear deformation holding device, so that effects such as ease of construction can be obtained. .

[Brief explanation of drawings]

1 to 4 show the state of use of the preliminary shear deformation retaining device according to the first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view, FIG. 2 is a side view, and FIG. 3 is a side view. is a plan view, and FIG. 4 is a perspective view. Fig. 5 is a perspective view of the rubber bearing used in the first embodiment, Fig. 6 is a partially longitudinal side view showing a state in which preliminary shear is applied to the rubber bearing, and Fig. 7 is a preliminary shear deformation holding device. FIG. 8 is a longitudinal cross-sectional side view showing a state in which the rubber bearing held in a shear deformed state is set on a support structure; FIG. 8 is a plan view showing a state in which a jack is set between the ends of each connecting member; FIG. The figure is a longitudinal sectional side view showing a state in which a structure is supported by a rubber bearing that has been subjected to preliminary shear deformation. 10 to 12 show the state of use of the preliminary shear deformation retaining device according to the second embodiment of the present invention, in which FIG. 10 is a longitudinal sectional side view;
FIG. 1 is a cross-sectional front view, and FIG. 12 is a plan view. FIG. 13 is a plan view showing the state in which the preliminary shear deformation holding device according to the third embodiment of the present invention is used. In the figure, 1: rubber bearing, 2: metal front support member, 3: metal rear support member, 4: lower metal plate,
5: Upper metal plate, 6: Metal connecting member, 7: Holding frame, 8: Rubber layer, 9: Lower locking protrusion, 1
0: Upper locking protrusion, 11: Lower plate, 12: Upper plate, 13: Rib, 14: Lower plate, 15: Upper plate,
16: Rib, 17: Lower locking protrusion, 18: Upper locking protrusion, 19: Bolt, 20: Separation prevention protrusion, 21: Recess, 22: Separation prevention protrusion, 2
3: recess, 25: lower locking recess, 26: steel pedestal, 27: steel pressing plate, 28: upper locking recess, 2
9: Rod-shaped roller, 31: Hydraulic jack, 32: Support structure, 34: Steel lower support plate, 36: Steel upper support plate, 37: Structure, 38: Jack.

Claims (1)

[Claims] 1 A metal front support member 2 and a metal rear support member 3 are arranged at the front and rear parts of a rubber bearing 1 which has been subjected to preliminary shear deformation so that the upper part is displaced forward and the lower part is displaced backward. , rubber bearing 1
The front end of the lower metal plate 4 in is connected to the front support member 2.
The rear end of the upper metal plate 5 of the rubber bearing 1 is engaged with the rear support member 3, and the rubber bearing 1
Both ends of the front support member 2 and rear support member 3 are connected via metal connection members 6 arranged on both left and right sides of A preliminary shear deformation holding device for a rubber bearing, characterized in that it is configured to be separable from the device.