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Jun 15,
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rail fish plate or joint bar, is one of several railway components. It takes on the task of connecting two rails and usually installed with fish bolt and nuts. Rail joint is one of the weak links in the whole railway track structure. So and how many different types of rail joint. Today, we will discuss the second one-- How many different types of rail joints.Three Factors Affecting Classification
Rail joint , also calledor, is one of several railway components. It takes on the task of connecting two rails and usually installed with fish bolt and nuts. Rail joint is one of the weak links in the whole railway track structure. So how to install rail joints and how to perform routine maintenance are particularly important. Before that, we need to figure out what is rail joint and how many different types of rail joint. Today, we will discuss the second one-- How many different types of rail joints.
In various kinds of rail joints, we divide them roughly into three categories according to the position of railway sleepers, the position of rail joints and the performance of rail joints. Next, I will share you more details about the three categories.
Under this category, we can still subdivide it into suspended rail joint and supported rail joint.In this type, rail joints are suspended between two sleepers. It has good stress condition, simple structure and it is easy to maintain. While the shortcoming of this joint is the fish plates are easily broken, as the fish plate is under greater pressure due to the rail deflection after wheel rolling. Therefore, in order to solve this problem, we need to reduce the space between sleepers to increase the flexural resistance of the joints. Although this type of joint is not perfect it is the most widely used one in railway construction worldwide.This kind of rail joints is placed directly on the sleepers. According to the number of sleepers, we can still divide it into:The former has only one sleeper under the rail joint. When the train passed through, the pressure transferred to the sleeper is uneven and the sleeper is shaken before and after. So the single-sleeper supported rail joint has poor stability.The latter has two sleepers under the rail joint. They help to disperse more impact force for joint. At the same time, the sleeper is a flexible support. There is a small seam between it and the rail joint. So it also has rail deflection but very small. The pressure on the joint is relatively small, too. But unfortunately, this kind of joint has high rigidity and difficult to tamp.There are also two types included in this category. The first one is the square joint and the second one is staggered joint.Rail joints on one track are exactly opposite to the joints on the other side are called square joints. This kind of joint is suitable for the straight rail line&#;and the rail line can be laid mechanically section by section. When trains passed through, the opposite two joints bear the impact force at the same time. It reduces the number of hits to the rail track . The running of the train will be more smoothly. At present, such joints are commonly used on railway lines.In this case, the distance between two opposite joints staggered half a rail. It mainly applies to the curved rail line and will disperse the impact force from wheel rolling, but it is not good for stability.The third category is based on the performance of rail joints. Under this category, we subdivided it into standard rail joint&#;compromise rail joint&#;conducting rail joint&#;insulated rail joint and welded rail joint.It is the most basic rail joint. The rails it connected are having same weight and length. There will be an 8-10mm seam left between two rails for expansion and contraction, but the seam will cause the damage to rail and track bed in the joint area. Therefore, we usually replace it with welded rail joint.It is mainly used to connect two different types of rails to make sure the continuity of railway. Under normal conditions, in order to make the top surface and the inner side head of rails are matched up, it will use the corresponding special-shaped rail joint and rail pad with it.This joint is regarded as a connector used for conducting track current or as a traction current circuit, usually applied to automatic block and electric traction area.This kind of joint adopts insulating material to prevent current conduction between two adjacent automatic block sections. For insulation purpose, we will use nylon rail track bolt sleeve and nylon rail joint to separate rail, joint and bolt.In this type, the end of rails is welded together to form a continuous long rail by resistance welding, small pressure welding or aluminum hot welding. The end of rails does not need to drill bolt hole and this rail joint is mostly used for seamless lines.Above is the classification of rail joints. Each one has its own advantages and disadvantages. Hope this article will help you to find the most suitable rail joint.
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A railway line is made up of many sections of rails, and each section of the rails needs to be connected by connecting rail fasteners. Variety types of rail joints and bolts are the connecting rail fasteners used for the connection between two rails. According to different rail joint bar dimensions and materials, types of rail joints can be classified into different categories. Next, we will detailed description about the types of rail joints under their differences.
The difference between heavy rail and light rail is the weight of the rail per unit length. The rail joints used on the rail with a weight of more than 30kg per meter is called the heavy rail joint, and the rail joints used in the rail with a weight of less than 30kg per meter is called the light rail joint. Heavy rail according to the use can be divided into general heavy rail and crane rail, general heavy rail is mainly used for high load railway track, crane rail is mainly used for crane track. Therefore, heavy rail joint can also be divided into crane rail type and general type. They also have different rail joint bar dimensions.
Due to the special needs of certain railways, various types of rail joints with insulation characteristic are required. Insulated rail joint is made of a high-strength composite material. Types of rail joints made of this material have the characteristics of anti-corrosion, anti-rust, anti-ultraviolet, no conducting, non magnetic, etc. Insulation rail joint shall be used with insulation supporting equipment such as insulation rail bolt, insulation block and insulation sleeve.
Usually, there are oval holes in the rail joint. There are two types of rail joints depending on the fastening capacity. They are four-hole rail joints and six-hole rail joints. They have different rail joint bar dimensions and the six-hole rail joint with stronger fastening capacity. The rail joint without holes is a special rail joint. Customers who customize this type of rail joint usually fix the rail joint on the rail by welding. This method requires higher welding technology of workers and requires more complex installation steps. Therefore, the economic cost of welding rail joint without holes connection is higher.
Compromise rail joint and bulged rail joint are different from the ordinary rail joints, and they have a special shape. They are used for rail connections in special situations. The compromise rail joint has the same width as the ordinary rail joint, and the rear part is wider than the front part. It is used for rails with different front and rear fastening sizes on special parts of the rail. When misalignment occurs between two sections of rails, or the misalignment position caused by the difference of rail type, the bulged rail joint should be used. The middle of the bulged rail joint is arched. The part of railway rail fixed with bulged rail joint bar belongs to the vulnerable part under stress, so it needs to be paid special attention to and maintained regularly.
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