Rail wood sleeper advantages

Rail Track Structure

The rail track structure is composed of several main parts, which are steel rails, rail sleepers, track beds, and rail fastening parts. It is defined that sleeper is a device that bears the pressure of the rails and transfers it to the track bed evenly. It is connected to the rails by rail fastening partss. Today we only talk about rail sleepers, focusing on the application of sleepers on the subway.

Rail Sleeper Types According to Application

Rail Sleeper According to Length

The length of the general sleeper is generally 2500mm, which is 2.5 meters; the length of the turnout sleeper varies according to the laying position, ranging from 2500 to 4800. Now there are many types of ballast, and there are also longer sleepers, which is rare to be seen.

Rail Wooden Sleeper Raw Materials

There are many kinds of sleeper materials, the earliest is the wood, the word "sleeper" is also derived from this. Wood sleeper is generally made of wood, such as masson pine, larch and other high oil content, its advantages and disadvantages are obvious.

Advantages of Wooden Sleeper

• Good elasticity. The stiffness (elasticity) under the rail is an important indicator of the track structure. Poor flexibility will cause extra damage to the rails and vehicles. The elasticity of the wooden sleeper is very good, and it is not even necessary to use the elastic spacer under the rail directly.
• Simple processing, transportation and laying. The wood can be directly processed into the required size and then the antiseptic solution can be soaked. It is also convenient because it is lighter to transport. Laying is the same reason, light and easy to transport the nature will be laid.
• Easy to connect with rails. The previous wooden sleepers were all made directly by a few dog spikes. Even if they were fixed, it was much simpler than the current type of fasteners. Of course, it is also a disadvantage, and it is not very reliable.
• Good insulation. The combination of wood + anti-corrosion oil, but how good the insulation in the end I .

Disadvantages of Wood sleeper

• Consumption of wood resource is not environmentally friendly. This needless to say, the basic wooden sleeper is grown up in the mountains, although it is now possible to use rotation and other methods to reduce the impact on the environment, but after all, there is still impact? It's okay to take the wood to make furniture.
• Uniformity is not good, uneven elasticity and strength. This is quite understandable. Different trees have different elasticities. Different locations of the same tree are also different. It is like that there are no two identical leaves, and there are no two sleepers. After all, natural growth is not the same model. from. This brings about the uneven stiffness under the rail, which is very unfavorable for the relatively fast running line, so now the wooden sleeper is mainly used in the depot, and the main line is basically unused.
• Erodible, short service life. Even it is soaked in preservative oil, and to be thoroughly soaked (now requiring a immersion depth of more than 13mm, different grade requirements are slightly different, not meticulous), but after all it is still wood, hardness, strength are not available with concrete, etc. Material ratio, wood sleepers can now use 10 years is very good. Ps, wooden sleeper looks black, because it is soaked with antiseptic oil
• The ability to hold dog spike is poor, and geometry is difficult to maintain. The form of the wooden sleeper fixed rail can be seen as the nail to the wooden sleeper (in fact, there are other fastening parts), the wheel will have a lateral force on the spike, the spike will move so are the rails, so that the gauge, which can be simply understood as the distance between the two rails, changes, and you need to adjust.

Due to the shortcomings of wooden sleepers, it was unable to adapt to the needs of high-speed, heavy-duty, passenger-only, and subway lines, and concrete sleepers emerged.