JPS5830819Y2 - rubber support - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a rubber support used in bridges, elevated structures, etc., in which the upper and lower surfaces of a rubber elastic body are sandwiched between reinforcing steel plates and joined together.

These rubber bearings are generally used for bridges, etc.
As shown in FIG. 2, a rubber elastic body 1 and a rubber support 3 whose upper and lower surfaces are sandwiched between reinforcing steel plates 2, 2 and bonded together by vulcanization or mounting are formed in a single layer. Alternatively, as shown in Fig. 1, a plurality of structures are layered and placed between a lower structure B such as a bridge pier and an upper structure 6 such as a bridge girder, and the load of the upper structure G and displacement such as expansion, contraction, and deflection of the upper structure G are controlled. It is released by deforming the rubber elastic body 1.

In addition, FIG. 1 shows an embodiment in which a lower structure member 4 is disposed on the upper surface of the lower structure B, and an upper support member 5 is disposed on the lower surface of the upper structure G to support the rubber support 3.

Here, if the upper and lower surfaces of the upper and lower structures G and B of the rubber support 3 are finished smooth, the upper and lower supports can be placed directly on the upper and lower structures G and B without using the member 4.5. It is possible.

By the way, when compressive force in the vertical direction is applied to the rubber support 3 having the above structure due to the weight of the upper structure G and the passage of vehicles, the rubber elastic body 1 deforms the reinforcing steel plates 2, 2 by the amount of deformation (settlement). It forms a convex curved surface in the vertical direction from the periphery, and produces an arc-shaped bulge in the horizontal direction (see FIGS. 3 and 4).

If such a phenomenon occurs repeatedly, stress will concentrate on the peripheral edge of the joint surface of the rubber elastic body 1 with the reinforcing steel plate 2, causing a problem that the rubber elastic body 1 will break at the location where the stress concentration is applied.

To be more specific, when the rubber elastic body 1 swells due to a compressive force in the vertical direction, an outward tensile force acts on the end portion of the rubber elastic body 1 (indicated by the arrow Z), and the reaction force 7 acts on the peripheral portion of the so-called reinforcing steel plate. A force (stress) in the opposite direction to the tensile force Z (arrow Y in the figure) concentrates on the periphery of the joint surface with 2, and a reaction force (stress) in the vertical direction to the compressive force (arrow X in the figure) occurs.

Therefore, when the stress Y due to bulge and the vertical stress X due to compression are repeatedly concentrated on the periphery of the joint surface between the reinforcing steel plate 2 and the rubber elastic body 1, the rubber elastic body 1 will break at the point where the stress is concentrated, as indicated by the symbol in the figure. It occurs like T.

Note that a similar phenomenon occurs even when a horizontal shearing force acts on the rubber support piece 3 due to displacement such as expansion and contraction and deflection of the upper structure G.

In this way, destruction of the rubber elastic body 1 of the rubber support piece 3, which supports the repeated vertical and horizontal forces, is caused by the support of the upper structure G. ffi G's expansion/contraction and deflection functions are impaired, causing the problem of having to replace the ~1L support 11゛3. Let's hope for the appearance of 3.

The present invention has been made to satisfy the above requirement (7).
The total relaxation of the stress concentration caused by the bulge in the rubber bullet 1'L body is calculated by River 4. This provides a rubber support with superior durability.

That is, on the side surface of the rubber elastic body which is held together by reinforcing steel plates and joined together, a concave portion is formed in the vertical cross-section as a concave curved surface 7 and in the shape of an arc with the maximum depth at the center of the side. The present invention provides a rubber bearing piece that is characterized by having an L shape.

Hereinafter, embodiments of the present invention will be described in detail.

Note that the same reference numerals are used for the horizontally drawn portions as in the conventional rubber support.

Reference numeral 6 denotes four parts provided on the side surface of the rubber elastic body 1, and the recessed part 6
The vertical cross-sectional shape is formed into an approximately arc-shaped four-curved surface 7 with the side surfaces being chords, and the cross-sectional shape is formed into a circular arc shape with the sides being wide.

The rubber support 3 of the present invention has four parts 6 having a concave curved surface 7 in the vertical cross section and an arc shape in the cross section on the side surface of the rubber elastic body 1. Even when a force is applied, the rubber elastic body 1 does not bulge out from the peripheral edge, so there is no stress concentration and damage to the rubber elastic body 1 can be alleviated (see FIGS. 8 and 9).

To be more specific, when a vertical (or horizontal) force is applied to the Goss 8 support 3, the recess 6 of the rubber elastic body 1
is deformed in such a way that a tensile force is applied toward the peripheral edge in both the side and side directions 2 (arrow Z in the figure), and (7) stress (arrow Y in the figure) is generated in the direction of the center 15 as a reaction force. 7
, and the reaction force (stress) due to vertical deformation (arrow X in the figure) is generated in the direction of the periphery, but the stress X is relieved by the stress Y generated in the side direction, so , the rubber elastic body 1 is attached to the peripheral edge of the contact/N surface between the elastic body 1 and the reinforcing steel plate 2.
It is also possible to alleviate the concentration of stress that would cause wave breakage.

The present invention has the above-mentioned configuration, and the rubber "supporting piece".
) By providing a recess with a concave vertical cross-section and an arc-shaped cross-section on the side surface of the rubber elastic body, stress concentration occurs at the periphery even when vertical and horizontal forces are applied. Since the bulge of the rubber elastic body can be alleviated, the rubber elastic body does not break and has a great effect of increasing the durability of the rubber, support, and body 1 and 2.

[Brief explanation of the drawing]

No. 1 is a cross-sectional view showing how a conventional rubber support is used;
FIG. 2 is a cross-sectional view of a conventional rubber bearing; FIGS. 3 and 4 are explanatory diagrams of the effect of a conventional rubber bearing on force;
5.S1 is a sectional view showing the use of the rubber support of the present invention, FIG. 6 is a sectional view of the rubber support of the present invention, and 7.
The figure is a plan view thereof, and FIGS. 8 and 9 are explanatory diagrams of the action of the go 18 support of the present invention on force. 1: Rubber elastic body, 2: Reinforced steel plate, 3: Rubber support, 6:
recess.

Claims (1)

[Scope of utility model registration request] In a rubber support in which the upper and lower surfaces of a rubber elastic body are sandwiched between reinforcing steel plates and joined together, the side surface of the rubber elastic body has a concave longitudinal section and a cross section with a maximum depth at the center of the side. What is claimed is: 1. A rubber support comprising an arcuate recess formed therein.