Under the winding body of the steel dragon, there are a group of silent watchers. They support 10000 tons of pressure with the body of pine, and use the texture soaked in oil to resist the wind and rain for a hundred years. When the train roars past, these black sleepers will always whisper in trembling, telling the scientific and technological code hidden in the anti-corrosion technology. In this world full of industrial aesthetics, the difference between turnout sleepers and ordinary sleepers is like a mechanical poem waiting to be deciphered.
1、 Pinewood's path to Nirvana
Entering the sleeper manufacturing base, the unique fragrance of pine wood and the mellow smell of anti-corrosion oil interweave into a unique industrial fragrance. These Pinus sylvestris var. mongolica from 45 ° north latitude have built a foundation between steel and sand with a compressive strength of 800 kg per square centimeter. Whether it is the 160 × 220 × 2500 (mm) type I sleeper that will become the cornerstone of the ordinary line, or the slightly slender 145 × 200 × 2500 (mm) type II sleeper, or the slender special members in the turnout area, they all embark on the same journey of evolution under the scratch and oil immersion.
Sawing process is the first ceremony of sleeper rebirth. The burrs and inclined heads are precisely cut off, and the length error is strictly controlled within ± 2mm. The scoring knife then came on stage, and a diamond grid with a depth of ≥ 13mm (high-quality pine ≥ 10mm) was carved on the wood surface, and the length of each knife mark was ≥ 10mm. This seemingly rough process is actually a precise mathematical expression - the rate of tool leakage in the track laying surface shall not exceed 5%, and the number of continuous tool marks shall not exceed 3.
2、 Equal baptism in oil bath
In the giant oil immersion tank, pine is experiencing a second life bloom. The 85 ℃ anti-corrosion oil, driven by the pressure tank, can complete the transformation under the same pressure, whether it is the standardized 2500 mm body of ordinary sleepers or the slender body of turnout sleepers with a maximum length of 4850 mm.
3、 Mechanical rhythm in size
As far as the current national standard is concerned, ordinary sleepers are generally 160*220*2500 (mm) and 145*200*2500 (mm), while turnout sleepers are different, which are divided into binary 20 and binary 15. The size range of turnout sleepers of base 20 type is 160*240*2600-4800 (mm), that is, the width and height of sleepers are 160*240 (mm), and the length starts from 2600mm, and every 20mm increase is a specification, which has been increased to 4800mm. The size range of the turnout sleepers of the base 15 type is 160*220*2600-4850 (mm). Similarly, the width and height of the sleepers are 160*220 (mm), and the length starts from 2600mm, and every 15mm increase is a specification, which has been increased to 4850mm.
The story of sleepers continues forever under the rail. They write the same anti-corrosion epic in different sizes. Those 20 mm and 15 mm progressive sections and 160 mm and 145 mm sections are just variations of railway engineers' spatial dimensions. In the dimension of time, each sleeper is telling the same language - that is the eternal oath composed by pine, nicks and preservative oil.
