Wooden sleeper is a kind of railway sleepers made of hard wood (hardwood sleepers, oak sleepers, treated pine sleepers) and treated by anti-corrosion and oil immersion. Wooden sleepers are the oldest and most widely used railway sleepers all over the world. With the progress of science and technology, railway sleepers, we also known as railroad ties derived two new types of railway sleepers, concrete sleepers and composite sleepers. However, the wooden sleeper still occupies the majority railway sleepers market because of its good flexibility and wide range of sources.
The Main Hardwood Material for Wooden Sleeper
When it comes to wooden sleeper, we are familiar with several hardwood sleepers, such as oak sleepers and pine sleepers. The hardwood materials of oak sleepers and pine sleepers have two things in common, one is that the oil content is relatively high, and the other is that the growth cycle is relatively long. The higher the oil content of the wood, the wear-resisting property of the wooden sleeper will be better, and it will not crack easily. Pine has a long growth cycle, fine rings, flexible wood texture and good elasticity. The wooden sleeper made of wood materials with the above characteristics can effectively disperse the pressure exerted by the train, thereby prolonging the service life of the wooden sleepers.
AGICO's criteria for selecting wooden railway sleeper materials
The maximum size of the live knot and dead knot within the track range is no more than 6cm. An open knot and a rotten one does not allow to appear.
Only one end of the end face is allowed to rot, but the depth shall not exceed 1% of the railroad tie’s length. The allowable slight rotten area of wooden sleeper shall not exceed 1% of the whole wood area.
Crack in wood:
The longitudinal crack length shall not exceed 40cm.
The total number of pest holes in the track-laying area of each wooden railway sleeper shall not exceed 5.
Treated Wooden Sleepers for Sale
Due to the fetuses of the wood, wooden railway sleepers are very susceptible to pests, environmental and climatic effects, causing decay. In some dry climate areas, the wooden sleeper is very easy to weathering erosion, resulting in the wooden sleeper cracking deformation. Therefore, in order to prevent the occurrence of these damages, the wooden sleepers are treated with anti-corrosion and anti-cracking before being sold.
The treated railway sleepers by corrosion are made by soaking the wood in chemical anticorrosive preparation through high temperature and pressure treatment by chemical method. Treated sleepers absorb enough preservatives to make them very strong, resistant to corrosion and waterproof. Treated railway sleepers laid on railway lines can effectively extend the service life.
For wooden railway sleepers shipped to dry areas more consideration needs to be given to the effect of the local climate on accelerating the cracking of the wooden sleepers. Increase the artificial drying time of the wooden sleepers appropriately, such as extending the vacuum time, or carry out more than two cycles. Treated railway sleepers will have a moisture content close to the balanced moisture content of the wood in this area, which can reduce the cracking and deformation of the wooden sleepers in transportation and use, thus extending the service life of the railway sleepers.
The Advantages of Wooden Sleeper Compared with Concrete Sleeper and Composite Sleeper
- Wooden sleepers have good elasticity, light weight and good insulation
- Wooden sleepers have many types of raw materials, the production process is simple, transportation is also very convenient
- Railway fasteners and wooden sleeper links are simple, laying and maintenance are very convenient
- There is a greater friction coefficient between the wooden sleeper and ballast, not easy to displacement.
- Wooden sleepers are better than other railway sleepers at absorbing the pressure generated by running the train and are less likely to break
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