Understanding of rail joint types and rail track seam

Rail Joint: the connection point of steel rails of rail track where rail joint bar and rail bolts are used, is called rail joint. A rail joint is a device that connects two pieces of rail on a railroad track. Rail fishplate is typically a piece of flat steel with two holes drilled at each end. The holes correspond to ones that are drilled into the ends of the rails and are bolted between the two rails to connect and hold them together. The rail joint also provides room for expansion when subjected to very high heat climates.

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Rail Joint Types:

1. According to relative position of rail joint bar and rail sleepers, it can be classified as cushion type and suspension type.
2. According to relative position of rail joints alongside the railway track, it is classified as staggered form(alternate joint) and opposite joint.
3. According to working performance and application, it is classified as ordinary rail joint and special rail joint(compromise rail joint, insulated rail joint, conducting rail joint, glued joint, Vibration resistant Rail Joint )

Reserved Track Seam:

• In order to meet the needs of thermal expansion and contraction of the rail, rail joints should be reserved at the rail joints. The reserved rail joints should meet the following conditions
• When the rail temperature reaches the local maximum rail temperature, the rail joint seam should be greater than or equal to zero, so that the rail end is not subject to the pressing force, in case the temperature pressure is too large and the rail track is expanded.
• When the temperature reaches the local minimum rail temperature, rail joint should be less than or equal to the structural rail, so that the joint bolt is not subjected to shearing force to prevent the joint bolt from being bent or broken. The structural rail joint refers to the maximum gap value of the rail end that can be realized by the dimension of the rail, the joint splint and the bolt.

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Two Types of Insulated Rail Joint and the Difference of Common Rail Joint and Insulated Rail Joint

Rail joint, also called rail fish plate, is used for connecting the ends of two rails. Rail joint plays an irreplaceable in securing the safety of the passengers and vehicles. Rail fish plate can be classified into many types in shape, common rail joint, glued rail joint, compromise joint bar, insulated rail joint, bulged rail joint.

Common types of Rail ]oint

Common Rail Joint

Common rail joint is widely used in rail track, and it has regular shape, with 4 holes or 6 holes on it. There are different standards of common fish plates to fit BS, UIC, GB, DIN, Africa, America steel rails.

Compromise Rail Joint

Compromise rail joint is used to connect two different rail sections and fit both rails exactly.

Insulated Rail Joint

Insulated rail joint are usually used for electrical resistance. It can be classified into bonded insulated rail joint and non-bonded ones.

Two Types of Insulated Rail Joint

Bonded insulated rail joint

Boned insulated rail joints are used to separate electric circuit in tracks and turnouts. Usually used in long welded rails, they must be able to transfer longitudinal forces arising in the track.

Advantages of Bonded Insulated Rail Joint

• Good electrical resistance in the long welded rails
• Impact-free transition between rails
• Reduce the noise, increase travelling comfort and prolong the service life of steel rail
• Four holes or six holes are all available

Poly-insulated Rail Joint

Polyurethane insulated rail joint is with a polyurethane insulation bonded to micro-alloy joint bar sections. This polyurethane plate can provide reliable circuit isolation and maintain electrical stability in the heavy rails under varying environmental conditions.

Advantages of Poly-Insulated Rail Joint

• Provide reliable circuit isolation and maintain the physical and electrical stability in rail track under different conditions.
• The polyurethane plate bonded to the rail joint provides superior insulation between the rail track and steel rails.
• The polyurethane plate and the rail joint forms a firm structure, they can serve for many years with little or no maintenance.
• Different specifications for choose to meet the different sizes of AREMA rail joint.
• Simple structure with easy installation, the insulated joint kit and the insulated bushing are packaged to each client.

The Difference of Common Rail Joint and Insulated Rail Joint

• Common rail fish plate is usually made of steel, while insulated rail joint is usually with insulated coating or polyurethane plate.
• Common rail joint is electricity conductive, while insulated rail joint has the features of non-conductivity and non-magnetic, corrosion-resistance.
• Common rail joint usually connects the end of two rails with rail bolt. Insulated coating and the polyurethane plate are needed in between the rail track and the rail joint before bolted with fish bolt.

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We receive enquiries in English, Español (Spanish), &#;&#;&#;&#;&#;&#;&#; &#;&#;&#;&#; (Russian), Français (French) and &#;&#;&#;&#;&#;&#;&#; (Arabic). Our professional team will reply to you within one business day. Please feel free to contact us!