Bridge Bearing

What is the purpose of bridge bearing

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A bridge bearing is a part of a bridge which typically supply a resting surface between bridge piers and the bridge deck.

The main purpose of a bridge bearing is to authorize controlled movement and accordingly reduce the stresses combine. Possible causes of movement are thermal expansion and contraction, creep, shrinkage, or fatigue due to the assets of the material used for the bearing. External sources of movement include the agreement of the ground below, thermal expansion, and seismic activity.

There are various different types of bridge bearings which are used depending on a number of unlike factors including the bridge span, loading conditions, and achievement specifications.

The elderly form of bridge bearing is simply two plates resting on top of each other. A general form of modern bridge bearing is the elastomeric bridge bearing. Additional type of bridge bearing is the mechanical bridge bearing. There are various types of mechanical bridge bearing, such as the pinned bearing, which in turn includes specific types such as the rocker bearing, and the roller bearing. Different type of mechanical bearing is the fixed bearing, which allows rotation, but not other forms of movement.

Types of bridge bearing

Steel bearings (flat bearings, curved bearings, rocker bearings, and roller bearings): Forces through steel contact surfaces. Bearing displacement is specially achieved by rolling steel and steel.

PTFE bearing (sliding bearing): The seat adopts PTFE and steel plate as the relative sliding surface of the bearing, and the sliding friction coefficient is much smaller than that of steel and steel.

Rubber bearings (plate rubber bearings, basin rubber bearings, PTFE plate-type rubber seats): The bearing force is achieved by a rubber plate. The movement of the carrier is achieved by sliding of PTFE or the shearing of rubber, and the supporting angle is deformed by the compression of rubber.

Concrete bearings (concrete hinge seats). Lead support: The strength part is composed of hard lead. As per to the structure of the bearing type, it can be normally divided into curved bearings, rock shaft bearings, roller bearings, plate rubber bearings, PTFE plate rubber bearings, basin rubber bearings, spherical bearings and so on. The bearings will be described separately below. Bearings are structural part that withstand high stresses. The load of the superstructure is concentrated in very small areas by the bearings. The reaction force of the roller bearing passes the linear contact force linking the roller and the rolling surface, and the force flow construct a significant stress consolidation phenomenon, which makes the contact surface bear high contact stress. And plate rubber bearings, tank rubber bearings, and spherical bearings and other bearings transmit reaction force, through the plane to the plane, the transmission is smooth, no strong flow necking phenomenon, which is a more reasonable power mode.


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    Types of Bridge Bearings and their Details

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    Bridge bearings are structure equipment or devices that are installed between bridge substructures or superstructures. The bearings are used to transfer the applied load on the bridge, including earthquake load, wind load, traffic load, etc. Bridge bearings are also responsible for the relative movements between the superstructure and substructure. For example, rotation and translational movements in horizontal or transverse directions.

    Bearings used in constructing bridges are divided into two major categories – expansion bearing and fixed bearing. While the expansion bearings can permit translational and rotational movements, the latter only allows rotational and some translational movements. DECG International is one of India’s best bridge bearing manufacturers that offer all the various types of bridge bearings and also guarantee high quality.

    Types of Bridge Bearing

     The different types of bridge bearings and their uses in various constructional areas are as follows:

    Pot Bearings:

    pot ptfe bearing manufacturer in india

    A bearing consisting of a metal piston supported by a disc of unreinforced elastomer that is confined within a metal cylinder for allowing rotational movement about any axis in horizontal plane and to bear and transmit vertical load. Pot bearings may be provided with sliding assembly (with or without restraint in the form of guide along a desired direction to bear and

    transmit horizontal force) comprising of stainless steel plate attached to metal backing plate sliding in horizontal plane over sliding material confined in recess(s) on the piston which shall be termed as Sliding / Guided Pot bearings. Depending on the desired degree of freedom Pot bearings may be of three types as follows:

    1. Fixed Pot Bearing
    2. Sliding Pot Bearing
    3. Guided Pot Bearing

    Rocker and Pin Bearings

    Rocker is an expansion bridge bearing that is composed of a curved surface at the bottom that can accommodate the translational movement and a pin on the top that facilitates the rotational movement of the bridge structures.

    Rocker and Pin bridge bearings are used in steel bridge structures and are considered when the bridge movement is known and described adequately. These bridge bearings can undergo severe corrosion and deterioration, making regular inspections and maintenance an essential part of the construction.

    Pin Bearing Manufacturer In India

    Roller Bearings



    Roller bearings are used to construct concrete or steel bridge structures. The roller bearing can be used in two different forms, namely – single roller and multiple roller bearings. Multiple roller bearings have several rollers installed under the two plates and can facilitate both rotational and translational motion for the bridge. One of the best things about roller bearings is that they are cheap to manufacture, but they have a limited weight capacity, making them suitable for specific constructions. On the other hand, multiple roller bearings are expensive and can short large vertical loads. These rollers need regular inspections and rehabilitation since they are susceptible to corrosion and damages.

    Elastomeric bearings

    Elastomeric bearings are elastomers manufactured from synthetic and natural rubber. These bridge bearings support both translational and rotational movements through elastomer deformation. Elastomeric bearings can carry large loads and prevent lateral bulging of the elastomers.


    Elastomeric Bearing Manufacturer in Indian

    The number of elastomer pads needed for the construction depends on the type of reinforcement used for the bridge. For instance, steel reinforces elastomeric bearings are the strongest, and plain elastomeric pads are the weakest. One of the best things about Elastomeric bridge bearings is that they are neither expensive nor require any maintenance after installation.

    Spherical Bearings:

    The Spherical bearings consists of a pair of matching concave and convex steel spherical backing plates with a low friction sliding interface in between them permitting the rotation by in-curve sliding. For the purpose of providing the translation

    Ability, bearings are combined with the flat sliding elements. Depending on the desired degree of freedom Spherical bearings may be of three types as follows:

    1. Fixed Spherical Bearing
    2. Sliding Spherical Bearing
    3. Guided Spherical Bearing

    Wrapping Up!

    DECG International is one of the best bridge bearing manufacturers in India. We ensure the proper manufacturing of the highest quality bridge bearings for all construction needs. We have an excellent infrastructure that helps us provide the best quality construction products to all our clients.

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      Everything You Need to Know about PTFE Structural Bearings

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      The bridge constructions must be done with utmost precision using the right components and parts. The bridges generally consist of two parts which are a substructure and a superstructure. The superstructure of the bridge has to face various dimensional deformations due to the type of pressure and load put on it. The deformations can include.

      • Bridge deformation under tremendous load
      • Wind loads
      • Thermal expansion
      • Creep and concrete shrinkage
      • Seismic force
      • Longitudinal force
      • Settlement of supports

      All this pressure and load can take a toll on the bridge. When the construction isn’t done properly, there can be bridge failure which can cause damage to property and life. Thus, it is essential to have a device placed between the substructure and the superstructure, which helps with adequate movements without damage to the bridge. The structures will help provide stability and adequate capacity to the bridge for facing the loads daily. For such cases, the most popular device is the bridge bearings, which offers great functionality to the bridge by allowing translational and rotational movements offering help support the vertical loads. It is the PTFE bridge bearings that are preferable options as they provide a vital interface between substructure and superstructure.

      PTFE structural bearings

      The use of PTFE in the manufacturing of bridge bearings has increased tremendously over the years. Although the application of PTFE bridge bearings isn’t possible in all structural bridge construction, they are still a highly preferred option.

      The PTFE bridge bearings come with an extremely low coefficient of friction and self-lubricating characteristics, which makes them resistant to the chemicals. Also, it offers them the ability to operate well even during high temperatures.

      On one side, an unmodified PTFE can be efficiently used for a PV value of 1,000. On the other side, a glass fiber, granite, or other inserted material PTFE can be efficiently used for PV values of 10,000 or more. This thus shows the PTFE bridge bearings can be used with PV valves at low speeds, which has coefficient friction as low as 0.05 to 0.1.

      The low PTFE coefficient of friction is because of two primary reasons.

      • The PTFE values against a stainless steel exhibit a lower coefficient of friction than when PTFE is used against a solid structure. Numerous studies have revealed the coefficient of PTFE between any two solid materials is the lowest.
      • The coefficient of PTFE bridge bearings greatly reduces with an increase in the pressure.

      Types of PTFE

      The PTFE is generally used in two types of structural bearings, which include.

      • Sliding bearings

      A PTFE slide bearing is a system of two plates wherein one plate slides over the other. This type of bearing allows for better longitudinal and transverse translation unless they are specifically restrained in any direction. But remember, no rotation is possible unless they are specifically provided in articulation form. Also, the bearing restricts the vertical loads.

      The PTFE slide bearings are generally used in instances where the span is less than 30m as the moving capacity of the bearings is generally small. The bearing is made up of two sheets which are generally preferred to be high-density carbon steel. In between the sheets, there is a layer of PTFE and polished stainless steel. The stainless steel section is attached to the bearing plate while the other section PTFE is attached to the other plate. Finally, a recess is created for providing better bonding on the bearing plate to which the PTFE is attached.

      The regular maintenance of the PTFE slide bearings is essential to ensure proper friction, or else the horizontal transmission force to the substructure will increase greatly. This is why the frequency lubrication of the bearing has been prescribed to be three years.

      • Pot PTFE Bridge Bearing

      This bearing consists of a circular non reinforced rubber pad that is entirely sealed inside the steel. The rubber present inside the bearing is prevented from any bulging with the pot walls, similar to a fluid present under high pressure. During the earlier times, the bearings were manufactured without PTFE. However, it was the requirement for horizontal movement besides the load-bearing capacity which made this a necessity. With the increasing demand for PTFE bridge bearings, you can easily find Pot PTFE bridge bearing manufacturers in India who can offer you high-quality bearings at a fair rate.

      The Pot PTFE bearings are preferred due to the high degree of rotation they provide to the bridges. The Pot PTFE bearings are difficult to manufacture due to the amount of recess required for the pot and the ceiling elements for properly storing the elastomer within the pot. This is why the ceilings are preferred to be metallic. Besides this, the PTFE plate must be placed well into the piston and provided with adequate dimples for additional lubricants during the time of installation.

      Standard working conditions for Pot PTFE bearings

      • A temperature range between -10° Celsius to 50° Celsius
      • A pot bearing of 1500 mm with scope for specification
      • Rotation up to 0.025 radians
      • Avoid standing pressure in excess of 40MPa bearing, based on the type of filler used.

      PTFE structure bearing design

      There are numerous design codes for structural bearings. But almost all prescribe the use of similar materials and have similar requirements about the strength and grade of the material. But in India, the Pot PTFE bearing is ORC:83, while for the sliding once there is no established system yet. Ultimately, the Pot PTFE bearing manufacturers in India must take the responsibility of designing bearing based on the customer requirement.

      Contact the best PTFE bearing manufacturer.

      There are numerous PTFE manufacturers in India, but to get the best, you can rely on DECG International for your bearings. We can offer you high-grade bearings that can fit well all your requirement. We can offer you fare priced products that can fit your requirements well and deliver you 100% satisfactory results. So, wait not and contact us today to make purchases of the highest quality bridge bearings in India.

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        DECG InternationalEverything You Need to Know about PTFE Structural Bearings
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