JPS607370Y2 - Elastic bearing with sliding plate - Google Patents

Description

[Detailed description of the invention] This invention is an elastic bearing based on elastic members such as rubber that supports upper structures such as bridge girders and building beams on lower structures such as piers, abutments, and foundations. More specifically, the present invention relates to an elastic bearing in which an elastic body that allows rotational displacement is provided with a mechanism that allows sliding displacement, and a movement restriction mechanism that limits the sliding.

In recent years, even in elastic bearings in which a sliding mechanism is added to an elastic body, it has been desired to provide movement restriction mechanisms in the horizontal (vertical) and perpendicular (horizontal) directions to the bridge axis in order to prevent bridges from collapsing due to earthquakes, etc.

However, in the past, in these elastic bearings, unevenness along the bridge axis direction was provided on the sliding surface to prevent displacement in the direction perpendicular to the bridge axis, that is, in the lateral direction (for example,
7-32736, Japanese Utility Model Publication No. 49-20965, and Japanese Utility Model Publication No. 50-2324), regarding the restriction of movement in the bridge axis direction, that is, the longitudinal direction, to relieve the expansion and contraction of bridge girders, The reality is that almost no consideration has been given to techniques other than those disclosed in Publication No. 11474.

However, in this known technique, it is necessary to form unevenness with different gaps between the elastic plates, and the forming process is complicated, and the movement limiting force in the bridge axis direction is not very promising. .

This invention was made in view of the above-mentioned problems, and
The purpose of the present invention is to provide elastic bearings that can smoothly absorb large displacements in the bridge axis (longitudinal) direction due to earthquakes, etc., and can effectively prevent bridge collapse. .

For this reason, the present invention consists of a support consisting of an upper sliding plate, a lower sliding plate, and an elastic plate, and (I) the upper sliding plate and the lower sliding plate are in sliding contact with each other, and the opposing surfaces of both sliding plates are A groove is formed in the vertical direction, and (II) a movement limiting member having a shaft inserted into the groove and flanges for restricting movement at both ends of the shaft is disposed between both sliding plates. .

The flanges of the movement limiting member are attached to both ends of the mandrel with a distance equal to the length of the sliding plate plus the amount of expansion and contraction of the upper structure (bridge girder).

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

Reference numeral 1 denotes an upper sliding plate, which is made of a steel plate, and has a smooth lower sliding surface 1a on its lower surface, and a semicircular groove 5 formed along the longitudinal direction (bridge axis direction) in its center. ing.

Anchor bolts 9 are also provided on the upper surface of the upper sliding plate 1.
Bolt holes are drilled in the mounting to which it is attached.

The upper sliding plate 1 is fixed to the lower surface of an upper structure such as a bridge girder G by embedding anchor bolts 9 therein.

Reference numeral 2 denotes a lower sliding plate, which is made of a steel plate, and has a smooth sliding plane 2a formed on its upper surface to provide good sliding contact with the lower sliding surface 1a of the upper sliding plate. A semicircular groove 5' is formed along.

3 is an elastic plate, which is mainly made of a hard or soft rubber body (usually chloroprene synthetic rubber) with a steel plate or canvas embedded as a reinforcing material, but it is of course possible to use only a rubber body. good.

The elastic plate 3 and the lower sliding plate 2 are firmly bonded (for example, by vulcanization bonding or bonding with an adhesive).

Reference numeral 4 denotes a movement restricting member, which is made of steel and includes a collar portion 4a provided at both ends and a shaft 4b connecting the collar portions.

The cross-sectional shape of the mandrel 4b corresponds to the cross-section formed by the grooves 5, 5' formed in both the sliding plates 1, 2, and has a circular cross-section in this embodiment, but i5, 5' are If the shape is square, the mandrel 4b will have a square cross section.

The flange portion 4a is provided integrally with both ends of the mandrel 4b by machining, or is manufactured separately and attached by welding or the like, and its shape is circular in this embodiment, but the shape is circular in the groove 5.
．． 5' may be any shape, such as a quadrilateral or other polygon.

The distance between the inner surfaces of the flange portions 4a of the movement limiting member 4 is set to a length that allows the upper structure G to expand and contract with respect to the length of the upper (lower) sliding plate. When the amount of expansion and contraction is δ, the length is L=c+δ.

Reference numeral 7 denotes a stainless steel plate or a coated hard chrome plated layer integrally arranged on the surface of the upper sliding plate 1 in order to further compensate for mutual sliding between the sliding plates, and the plate surface of the sliding plate is sufficiently smooth and Of course, it can be omitted as long as it is rust-free.

Reference numeral 8 denotes a sliding plate that constitutes the lower sliding surface 2a of the lower sliding plate 2, and the lower sliding surface 2a is coated with a solid lubricant such as molybdenum disulfide (MoS2) or a synthetic resin such as fluororesin on the lower sliding plate 2, or Alternatively, a synthetic resin plate such as fluororesin is arranged by gluing, screwing, or fitting.

The configuration of the present invention is not limited to the above-described embodiments, and various design changes are possible without departing from the basic technical idea of the present invention.

For example, although the embodiment has been shown in which the groove 5° 5' in which the movement limiting member 4 is disposed is provided at one location in the center of each sliding plate,
It is also possible to provide a plurality of slide plates along the vertical direction on opposing surfaces of the slide plate.

The elastic bearing of the present invention has the above configuration, and its installation procedure and function will be described below.

The installation of this elastic bearing consists of upper sliding plate 1 and lower sliding plate 2.
, after assembling the elastic plate 3 and the movement limiting member 4, the direction of i5, 5' of the sliding plate, that is, the axis of the shaft 4b of the movement limiting member 4 is along the bridge axis (longitudinal) direction, and it is attached to the upper surface of the pier B. This elastic bearing is fixedly installed.

After that, the upper sliding plate is installed in advance by pouring concrete for the bridge girder G so as to embed the anchor bolts 9 screwed into the bolt holes 6, and attaching the elastic bearing to the lower surface of the bridge girder G.

This elastic bearing installed in this way absorbs the deflection of the bridge girder G with the elasticity of the elastic plate 3, and the expansion and contraction of the bridge girder G is absorbed by the upper and lower sliding plates using the movement limiting member as a guide. This is absorbed by the sliding lower surfaces 1a and 2a of the elastic bearing, and no excessive stress is generated in the elastic bearing.

When excessive displacement occurs in the bridge girder G due to an earthquake, etc.,
The upper sliding plate 1 slides on the lower sliding plate 2 in the vertical direction, but if it moves beyond a certain amount, it is stopped by the collar 4a of the movement restricting member, so that the bridge is prevented from falling in the vertical direction.

In addition, in the lateral direction (perpendicular to the bridge axis), the shafts 4baR5, 5' of the movement limiting member do not engage and move, and the bridge collapse in the lateral direction is also prevented.

The elastic bearing of the present invention has the above-described structure and the above-described functions, and has the following various superior effects compared to conventional bearings.

■ The upper sliding plate slides vertically on the lower sliding plate as the bridge girder expands and contracts, but excessive displacement is prevented by the collar of the movement restricting member, so it does not dislodge from the lower sliding plate. Vertical bridge collapse is prevented.

(2) Further, in the case of lateral displacement, the shaft of the movement limiting member engages with the groove of the sliding plate, and movement is restricted, so it is possible to prevent the bridge from falling in the lateral direction.

■ In order to limit the mutual movement of the sliding plates, it is not necessary to process complicated uneven surfaces on the sliding plates, and it is only necessary to form grooves, which simplifies the structure and facilitates molding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an installation procedure diagram, and FIG. 3 is a functional explanatory diagram. 1... Upper sliding plate, 1a... Sliding plane, 2... Lower sliding plate, 2a...
Sliding plane, 3... Elastic plate, 4... Movement limiting member, 4a... Tsuba, 4b... Mandrel, 5, 5'... ··groove.

Claims (1)

[Claims for Utility Model Registration] An upper sliding plate 1 attached to the upper structure G, a lower sliding plate 2 in sliding contact with the upper sliding plate 1, and a lower sliding plate 2 fixed to the lower sliding plate 2 and installed on the lower structure B. elastic plate 3
and a movement limiting member 4 disposed in the bridge axis direction between the upper slide plate and the lower slide plate, wherein the upper slide plate 1 has a slide plane 1a on the lower surface and is moved in the transverse axis direction. The lower sliding plate 2 has a sliding plane 2a on its upper surface that slides in contact with the sliding plane 1a of the upper sliding plate, and a groove 5 corresponding to the groove 5 of the upper sliding plate along the bridge axis direction. ', and the movement limiting member 4 is provided with grooves 5.5' of both sliding plates 1 and 2.
The mandrel 4b and both sliding plates 1 are fitted over the entire length of the shaft 4b.
, 2 plus the amount of expansion and contraction of the upper structure G, and a flange 4a protruding from both ends of the mandrel 4b.