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RB (Multilayer Natural Rubber Bearing)
Rubber Bearing

Features

  • Can satisfy the requirements for stable performance of bearings by supporting loads and allowing elongation and rotational absorption of bridge girders over a long period of time.
  • Customizable dispersion ratio of horizontal force during an earthquake will allow the bridge design to be more reasonable.
  • Maintenance is easier compared with steel bearings.
  • Simpler structure provides with ease of replacement work.

Structure

Cure adhesion multilayer rubber bearing with alternately piled up rubber and steel plate.

Basic Characteristics of RB (Multilayer Rubber)

The Effect of Multilayer Rubber

The Effect of Multilayer Rubber

1.Steel plate reinforced rubber will firmly support the structure. (Load supporting, rotational absorption function)

High rigidity in the vertical direction as compared to the single rubber provides with the stable support of the structure.

2. Transform the seismic vibration into a slow movement. (Horizontal Elasticity Function)

Softness in the horizontal direction will calm down the severe seismic vibration, and make it a long-period vibration of the structure.

3. Returns the structure to the original position (Restoration function)

The restoration force of the rubber will return the structure to the original position after the earthquake terminated.

The Durability of Rubber Bearing

The elevated railway bridge in Australia (Melbourne) built in 1889 using the natural rubber (single layer) for a countermeasure to the vibration/noise is considered as the oldest still existing practical example of rubber bearing for the bridge in the world.

As a full-fledged application of multilayer rubber bearing, the use for Pelham Bridge (steel bridge) in UK (Lincoln City) is considered as the first practical example. After that, the multilayer rubber has been a share of bridge bearing until today.

On the other hand, the oldest example in Japan is the chloroprene multilayer rubber bearing used for Kinugawa Bridge for Tohoku Main Line in 1961, and this bearing is still in use with no problem for 40 years after installation.

Elevated Railway Bridge (Melbourne)
Installed in 1889

Kinugawa Bridge
Installed in 1961

Examples of Installation

RB can be applied to the wide variety of bridges, such as concrete bridges and steel bridges.

Basic Characteristics Verification Test

A great number of basic experiments and confirmation of property are being conducted to prove the performance of rubber bearings.

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