DECG International

We are manufacturer of high-end quality Bridge Bearings, Bridge Expansion Joints & Building seismic Expansion Joint systems, MS Casting, Rubber products, and steel girders and other heavy fabrication work.

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Bridge Expansion Joints

Connecting Expansion Joint With Main ReinforcementThe preliminary fixing is made by evenly placing then welding of rebars over the entire length between the anchorage and the deck reinforcement.Should you have any other questions about Expansion Joints please contact us Mobile: [phone] Email: [email protected]

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Use of expansion joint in building

Expansion joint is very essential in building to reduce the cracks because of thermal variation. Bureau of Indian standard fixed the some length of buildings above which the one or more expansion joint is required in building.

An expansion joint is provided in concrete to authorize the movement of structural elements due to temperature, moisture & other changes.

It recognize concrete structure to expand or contract due to thermal variation without causing stress, which can lead to reduce the cracking in a building.

Expansion joints break the long concrete structure in separate parts that help to prevent the transformation of earthquakes vibration on other parts of buildings.

If an earthquake occurs, the long structure act as a two or more dissimilar structure due to expansion joints.

It is also known as movement joints, can be use not only in buildings but also in bridges, sidewalks, railway tracks, piping systems, ships, and other structures. Expansion joints can be incorporated into various building parts to supply complete separation like floors, ceilings, walls, roofs, and facades. They can be placed floor-to-floor, floor-to-wall, wall-to-wall, ceiling-to-ceiling, ceiling-to-wall, roof-to-roof, or roof-to-wall.

It may serve more than one “joint” purpose at the same time. Generally, these joints isolate a frame into a series of segments with sufficient joint width to allow the building’s thermal expansion. By isolating the segments, expansion joints also recognize relief from cracking due to contraction and therefore act in a dual role an expansion and a contraction joint.

Where are expansion joints required?

Expansion joints are awaited to fulfill certain criteria like:

Having high load-carrying volume (e.g. vehicle wheels load) Water tightness in the joint and its link at each side to prevent leaking. Suitability for pedestrian traffic (e.g. with high-heeled shoes) Resistance to aggressive substances Reducing vibrations in provision where delicate goods are being transported (e.g. in glass factories) Should be eye-pleasing. Types of Joints Interior Floor Joints Exterior Floor Joints Interior Wall/Column Celing & Exterior Wall Parking Joints

Architectural expansion joints recommended in: Commercial Buildings , Residential Buildings. Hotels, Hospital, Institutional Building, Offices. Educational buildings. Airports. Metro stations & Railway stations. Parking, Podium structures. Stadium.

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Types of Bridge Bearings and their Details

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:

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:

Fixed Pot Bearing

Sliding Pot Bearing

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.

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.

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:

Fixed Spherical Bearing

Sliding Spherical Bearing

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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Bridge Expansion Joints Manufacturer in India

ASPHALTIC PLUG JOINT

Asphaltic plug joint for movements up to 40 mm is a simple bridge expansion joint filled with asphalt. TST (crushed stone) elastic material is a special type of elastic-plastic material with high viscosity. Being heated sufficiently to melt, it can be poured into gravel and will be shaped into asphalt concrete form after molding to bear vehicle load. The most advantage of  Asphaltic plug joint is that the bridge can be opened to traffic after two hours of construction.

COMPRESSION SEAL EXPANSION JOINT

The Compression Seal Expansion Joint System is an extruded, neoprene rubber material. When compressed into a gap, this system provides an excellent sealing against the expansion and contraction. The Compression Seal Expansion Joint System is used for small movement up to 40mm expansion joints, in deck of parking, pre casted structures and other types of concrete structures.

STRIP SEAL EXPANSION JOINT

The Strip Seal Expansion Joint System consists of a rubber gland, mechanically tightened between two steel edge members and provides a superior watertight proofing system. The design of the DECG Strip Seal System can easily accommodate

the high loads of vehicular traffic while effectively sealing joints in bridges and structures with very high movements up to 120mm it is to be noted that IRC recommend strip seal

joint for movement up to 80mm. DECG Strip Seal Systems can be manufactured to accommodate a variety of field configurations along with multidirectional movements.

The DECG Strip Seal has been engineered so that the elastomeric Seal can be inserted either prior to or after the securing of the steel shapes to the superstructure. Machined Steel shapes maximize Seal install ability and minimizes manufacturing tolerance.

STRIP SEAL EXPANSION JOINT WITH SINUS PLATE

The use of “sinus plates” reduces the noise from over-rolling traffic by up to 80 % by covering the straight transverse gap in the carriageway. The wheels of over-rolling vehicles thus maintain constant contact with the expansion joint’s surface, eliminating the noise caused by impacts with the gap edge. The special shape of the sinus plates also enables motorcycles and bicycles to cross the joint safely. DECG expansion joints featuring sinus plates are ideal for use on bridges near residential areas or in other noise-sensitive zones.

MODULAR EXPANSION JOINT

Modular expansion joints are used when the movements of a bridge exceed the capacity of a single gap joint or a finger type joint. The individual gaps are sealed by watertight elastomeric profiles, and surface beam movements are regulated by an elastic control system. Modular multiple-gap expansion joints can accommodate movements in every direction and rotations about every axis. They can be used for longitudinal movements of as little as 160 mm, or for very large movements of well over 3000 mm.

FINGER TYPE EXPANSION JOINT

Finger Type expansion joints used in bridge construction are an ideal component to accommodate bridge expansion and contraction while reducing the amount of noise pollution that occurs in other alternative joint types.  The primary components of the Finger Type expansion joint consist of steel plates (sliding) that are connected to each side of the road surface’s gap. Finger Joints are designed with in a (fingers of a hand) type of pattern, where the steel plates accommodate movement within one another & allow movement along the axis of the fingers themselves. Since there are no moving parts attached to the joint, cantilever moments reduce the stress induced to the structure. There is a large replaceable gutter below the joint which is made of reinforced neoprene and provides an efficient drainage system into the bridge’s ducts. The gutter also limits the build up of standing water to reduce the possibility of vehicles aquaplaning.

SLAB SEAL EXPANSION JOINT

SLAB SEAL joint will consist of steel insert and elastomeric slab unit. This type of seal is recommended for simply supported or continuous spans, right or skew (less than 20 degree), moderately curved with maximum movement upto 50mm.

RAILWAY EXPANSION JOINT

Indian railway having their own expansion joints made of steel angles with loops and cover plates, we have supplied many prestigious railway projects.

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Bridge Bearing Manufacturer

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:

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:

Fixed Pot Bearing

Sliding Pot Bearing

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.

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.

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:

Fixed Spherical Bearing

Sliding Spherical Bearing

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.

Reference Sources:

Civildigital

Constructor

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Pin Bearings Manufacturers

Pin Bearings Manufacturers

Pin bearing consists of a metal pin attached to a metal cylinder to bear and resist horizontal force along with all directions on the vertical plane and facilitate rotation movements about any Horizontal axis. The pin bearing does not bear or transmit any translational motion.

Pin bearings are not structurally complex and do not resists any vertical loads. It is one of the most common fixed bearings used in bridges.

Specifications of Pin Bearing

The upper plate of the bearing is either bolted or welded with the soleplate and the lower curved plate is attached to the masonry plate. The pin is connected to the adjacent structure with the help of backing plates and studs welded on it for the smooth transfer of horizontal force from the superstructure to the substructure.

Pin bearings are very strong and can be resistant to corrosion if the steel is of high quality. Moreover, other factors that affect the effectiveness of a pin bearing in a bridge are the load, climate changes, and types of materials used.

Wrapping Up!

DECG International is one of the best manufacturers of high-quality pin bearings for bridge constructions. Besides pin bearings, we also provide a wide range of other construction requirements for all small and large-scale construction projects, including buildings, bridges, railways, etc.

Besides Bridge Bearings, DECG International provides the best construction solution for expansion joints, railway girders, rebar couplers, and several repair and maintenance services. We are one of the best manufacturers of construction parts and ensure the best quality products catered to your needs. We also provide customized solutions engineered and designed for specific constructions. Our engineers have years of experience to understand and provide you with the best construction solution for your buildings and bridges.

Reference Sources:

Nipponchuzo

Constructor

Place order/enquiry Our Head Office/Works DECG House, Plot #69-C, Sector A, Bhopal-Hoshangabad Road (NH-46) Mandideep-462046, Madhya Pradesh [phone] [phone] [email protected] [email protected]

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Spherical Bearings Manufacturers

Spherical Bearings Manufacturers

Spherical bearing, also called spherical bridge bearing, is one type of bridge bearings with large rotation capacity. Similar with pot bearing, spherical bearing also can be divided into three types: fixed spherical bearing, guided spherical bearing and free sliding spherical bearing. With high strengthened steel body, spherical bearing is especially designed for high vertical, horizontal and lateral loads and where large rotational structural displacements need to be accommodated.

Spherical bearing types

Fixed spherical bearing only allows for rotations, any longitudinal or traversal movement is restrained. Guided spherical bearing with edge steel guide accommodates unidirectional movements. Free sliding spherical bearing can slid in all directions.

Working principle of spherical bearing Spherical bearing is formed by top steel plate, stainless steel slide, PTFE slide, convex plate, curved PTFE and concave plate. The sliding of convex plate and concave plate can accommodate the structural rotations of the beam end. The stainless steel slide and PTFE slide can further reduce friction coefficient, thus displacement of expansion and contraction can be accommodated. While, depending on whether the spherical bearing is fixed, guided or free sliding, the vertical loads, horizontal forces, longitudinal movements or transverse movements can be accommodated. What’s more, the guided bar and the restraining ring also can transmit the horizontal forces. Thus, spherical bearings are especially suitable for more complex bridges.

Main technical performance

Spherical bearing vertical loading capacity (kN): 1000, 1500, 2000, 2500, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, 12500, 15000, 17500, 20000.

Design displacement of spherical bearing

Design friction coefficient of spherical bearing (in condition of PTFE layer with silicon grease lubrication and stresses about 30 MPa). Normal temperature type: 0.03. Cold resistant type: 0.05.

Design friction coefficient of spherical bearing (in condition of PTFE layer with silicon grease lubrication and stresses about 30 MPa).

Horizontal force spherical bearing can withstand

Working temperature

Bridge in longitudinal direction 1000 – 2500 kN e = ±50 mm e = ±100 mm. 3000 – 20000 kN e = ±50 mm e = ±100 mm e = ±150 mm.

Bridge in transverse direction Free sliding spherical bearing e = ±40 mm. The design displacement can be customized according to the project requirements).

Normal temperature type: 0.03.

Cold resistant type: 0.05.

Normal temperature type: 0.03.

Cold resistant type: 0.05.

Normal temperature type: -25 °C to + 60 °C.

Cold resistance type: -40 °C to + 60 °C.Features

Large vertical loading capacity.

Allows for large horizontal displacement.

Better adapting to the large rotations.

Minimum sliding friction coefficient.

More suitable for the low temperature regions.

High strengthened stainless steel makes it durability.

Long termed economic cost.

Application

Applicable bridges: RC bridge, PC bridge, steel bridge, railway bridge, easy dropping bridge, ends inclined bridge, etc.

Applicable bridge conditions: bridges with large turning angles, wide and curved bridges, bridges with big torsions, bridges in low temperatures lower than -30 °C, etc. Maintenance of spherical bearing

During using, the spherical bearing needs to be inspected and maintained regularly. And the inspection items are as following:

Checking whether the anchor bolt is cut and the rubber sealing is cracking and aging.

Checking whether the relative displacement of the spherical bearing is uniform and record the displacement one by one.

Clean the debris and dust around the spherical bearing, while at the same time, using the cotton cleans surface of the stainless steel.

Loose the anchor nut regularly, clean and oil the anchor nut to avoid rust, and then fasten the anchor nut.

Check the height changing of the spherical bearing to confirm the abrasion condition of the PTFE slide. And when the height of spherical bearing changes over than 3 mm, the rubber sealing should be removed to inspect the condition of the PTFE slide.

Painting the steel components of the spherical bearing regularly to avoid rust destroy (except the stainless steel slide).Ref: bridge bearing Our Head Office/Works DECG House, Plot #69-C, Sector A, Bhopal-Hoshangabad Road (NH-46) Mandideep-462046, Madhya Pradesh [phone] ,[phone] [email protected], [email protected]

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Rocker Roller Bearing Manufacturers

Rocker Roller Bearing Manufacturers

For railway bridges with spans in excess of 30.5m, where open web through girders are generally provided, the amount of movement needed and the vertical load transmitted through each bearing is too large to be catered by the sliding bearings. It is common, on Indian railways, to provide rocker and roller bearings at the free end of the open web through girders, and rocker bearings at the fixed end.

The roller bearing consists of a base plate, two or more rollers, and a top plate. The rocker and roller end is made by providing a saddle and knuckle plate on top of the rollers whereas the same arrangement except rollers is at the rocker end. The rocker and roller end of bearing permits translation as well as rotation, whereas the rocker end permits only rotation.

A moderate amount of maintenance can keep the bearings intact and can continue to work properly for a long period of time.

Standard Bearings

Rocker bearings are of various types and styles which are only limited by the imagination of the engineer or the designer. Some railroad companies still have the standard types and sizes. The standard styles are Expansion Rocker Bearings and Fixed Rocker Bearings.

Connections

These bearings are built up by welding two relatively large and thick pieces of plates. The top plate or saddle plate is connected to the end of the bottom chord. Since this connection is crucial for transmitting the horizontal thrust from the bottom chord to the bed block, it must be made a tight fit. The top plate is generally installed to the underside of the bottom chord in situ. However the joint is not amenable for riveting for want of adequate space. The number of rivets required and their lengths will also be very large. The joint is therefore made with turned and fitted bolts. The reaming of the holes in the bottom chord and the saddle is therefore required to be done by assembling them together. The barriers are designed with several welding practicalities taken into account, and it also allows the welder to access all the joints that are needed to be welded together. Excessive weld sizes of the design of partial and full penetration groove weld when unnecessary needs to be avoided. Over-done or unexpected welding can add extra cost to the bearings and add reduced durability or service life to the bearing. These are especially recommended on railroad structures where large impact loads are sustainable.

Material

The mild steel to be used for the components of the bearings IS 2062-1192 shall comply with the IS 2062-1192. The steel for forging to be used for the components of the bearings shall comply with class 3, 3A, or 4 of IS: 1875 and the steel forging shall comply with class 3, 3A, or 4 of IS 2004.

The pins which are used in rocker bearings can be simple cold-rolled steels like C1018 or can be heat-treated forged with other materials such as ASTM 688 Classes B through F Nuts (Recess Pin Nuts or Plain Pin Nuts). These nuts and recesses should be of the same material as the steel plates.

The grease on the pins and mating parts should be waterproof with medium-consistent grease. Grease fittings for the lubrication of hidden parts can be provided when there is a need for the structure. The coating on the bearings is high-performance paints which include high-solids zinc primers or the bearing assemblies can be metalized with zinc thermal spray coatings. Galvanized or carbon steel components can be considered for the paint coating on demand. The coating recommendations can be made from any long-lasting products irrespective of the environmental conditions.

Structural Design

The design of rocker and roller bearing involves the selection of roller length, its diameter, the radius of the contact surface of saddle/ knuckle, thickness and plan size of the base plate and number and size of anchor bolts. Simple design rules are provided in the IRS: steel bridge code to obtain these values.   Maintenance crews need to have better access to all the lubrication points and grease fittings. These bearings rock easily, and special fixtures or temporary constructions are often needed to prevent any unwanted movements during the building of all structural elements.

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North East Our Head Office/Works  DECG House, Plot #69-C, Sector A, Bhopal-Hoshangabad Road (NH-46) Mandideep-462046, Madhya Pradesh [phone] ,[phone] [email protected], [email protected]

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Bridge Bearings Manufacturers & Suppliers, Bridge Expansion Joints, Building Bearing and Building Expansion Joints

We are manufacturer of high-end quality Bridge Bearings, Bridge Expansion Joints & Building seismic Expansion Joint systems, MS Casting, Rubber products, and steel girders and other heavy fabrication work. Our Head Office/Works DECG House, Plot #69-C, Sector A, Bhopal-Hoshangabad Road (NH-46) Mandideep-462046, Madhya Pradesh [phone] [phone] [email protected] [email protected]