Introduction and application of rubber beams

1.Introduction

The rubber beam is vulcanized and bonded by a multi-layer rubber sheet and a thin steel plate. It has sufficient vertical steel to reliably transmit the reaction force of the upper structure to the abutment;

It has good elasticity to adapt to the beam end. Rotation, and greater shear deformation ability to meet the horizontal displacement of the upper structure.

In addition to the PTFE plate on the surface of the above-mentioned plate rubbemr beam, it can be made into a PTFE sliding plate rubber beams. In addition to vertical steel and elastic deformation, it can withstand vertical loads and adapt to beam end rotation.

In addition, due to the low friction coefficient of the PTFE plate, the beam end can slide freely on the surface of the PTFE plate, and the horizontal displacement is not limited. It is especially suitable for bridges with medium and small loads and large displacement.

The rubber beam not only has excellent technical performance, but also has the characteristics of simple structure, low price, easy maintenance and replacement of buffer isolation and low building height. Therefore, it is popular in the bridge industry and is widely used.

2.Application

Ordinary rubber beams are suitable for bridges with a span of less than 30 m and a small displacement. Different plane shapes are suitable for different bridge span structures, rectangular supports for orthogonal bridges; curved bridges, oblique bridges and circular piers for circular bridges Shape support.

The PTFE plate rubber beam is suitable for large displacement bridges with large span, multi-span continuous and simply supported beam continuous plates. It can also be used as a slider for continuous beam pushing and T-beam traverse. Rectangular and round PTFE plate rubber bearings are used in the same way as rectangular and round plain plate rubber bearings.

It is made of multi-layer rubber sheet and thin steel plate inlaid and bonded. There is enough vertical steel to bear the vertical load, and the reaction force of the upper structure can be transmitted to the abutment; it has good elasticity to adapt to the rotation of the beam end, and has large shear deformation to meet the upper structure. Horizontal displacement.

GJZ Rectangular GYZ Round Rubber Beam Features: This product has been widely used in bridge construction, hydropower engineering, and earthquake-resistant buildings. Compared with the original steel support, it has simple structure and convenient installation;

saves steel and is inexpensive; It is easy to change, easy to change, etc., and the building height of this product is low, which is beneficial to bridge design and cost reduction; it has good isolation effect, which can reduce the impact of live load and seismic force on buildings.rubber beams

3.Rubber beam parameters requirement

(1) the compressive strength, compressive strength, compressive strength) code sigma BC, refers to the strength of the external forces applied pressure limit. To understand the characteristics of stone and whether it is suitable in engineering, the mechanical strength test of rock must be done first.
(2) young’s modulus of elasticity:
Young’s modulus of elasticity is one of the bases for selecting the materials of mechanical parts.
(3) poisson coefficient
In solid mechanics, the lateral deformation coefficient of materials is known as poisson’s ratio, also known as poisson’s coefficient.
When a material is compressed in one direction, it will extend in two other directions perpendicular to that direction. This is the poisson phenomenon. Poisson ratio is a dimensionless physical quantity used to reflect the phenomenon of cypress pine.

4.Determining the bearing capacity of rubber beams

The bearing capacity of a bridge rubber bearing depends on the following three conditions:

(1) The rubber itself is crushed or cut;

(2) The rubber produces more than the permitted compression deformation and shear deformation;

(3) When the support is under pressure (concrete, steel plate or the like), the contact surface of the support and the rubber slips off when the horizontal shearing force of the rubber is broken by the outward shearing force of the rubber.

Through a large number of experiments, it is proved that the rubber beams on the surface of the bridge rubber bearing has compressive strength and shear strength, and is rarely directly crushed or cut.

Here, the rubber material of the rubber bearing is artificial synthetic neoprene (also known as Nat rubber) and vulcanized natural rubber.

There are also butyl rubber and rubber compounds. When calculating the rubber bearing strength, the allowable stress is determined by the bearing capacity in the cases of (2) and (3).

5.Chemical composition rubber beams

 

Composition (%)

Natural rubber High strength reclaimed rubber  

Sulfur

Rubber vulcanization accelerator Carbon black Stearic acid C2

Accelerator

Anti-aging agent
Natural Rubber 19.0 71.0 0.9 0.5 7.0 1.0 0.30 0.30

 

Eternal Bliss Alloy Casting & Forging Co, Ltd.

Technical Dept.

E-mail: sales@ebcastworld.com

what’s app: 0086-13093023772

William