As an important artery of the national transportation network, the safe and stable operation of railways cannot be separated from the support of complete underground infrastructure, and the drainage system is one of the "invisible guardians". Under and around the railway track, problems such as groundwater level changes and rainwater infiltration may threaten the stability of the track, and even cause safety hazards such as sedimentation and water accumulation. Therefore, the performance of drainage pipes is extremely demanding - not only to withstand the long-term impact of train loads, but also to have excellent corrosion resistance and deformation resistance.

HDPE carat pipe (high-density polyethylene wound structural wall pipe) has become an ideal choice for drainage projects under railways due to its unique material characteristics and structural design. It uses high-density polyethylene as raw material and is made through a special winding molding process. The inner wall is smooth and the outer wall is corrugated. This structure not only gives the pipeline excellent ring stiffness (different grades can be customized according to needs, up to SN12.5), which can effectively resist the extrusion caused by external soil pressure and train load. At the same time, HDPE material itself has strong chemical corrosion resistance, which can resist the erosion of acid and alkali substances in the underground soil and prolong the service life of the pipeline. More importantly, the flexibility of HDPE carat pipe makes it able to adapt to uneven settlement of the foundation, and it is not easy to break under the long-term vibration load of the train, which greatly reduces the risk of pipeline leakage and fundamentally guarantees the stability of the railway drainage system.

In practical applications, the installation of HDPE carat pipe under the railway can also significantly improve the construction efficiency and safety. Compared with traditional concrete pipelines, HDPE carat pipes are light in weight and have good flexibility. They can be constructed by trenchless technologies (such as pipe jacking and directional drilling) to reduce the excavation of existing railway lines, shorten the construction period, and minimize the interference to surface traffic and railway operations. As a leading enterprise in the domestic pipeline industry, AD Pipeline's HDPE carat pipes strictly follow national standards. It has undergone multiple quality controls from raw material procurement to production process to ensure that each section of pipeline has the characteristics of high strength, high toughness and low noise, providing a reliable "underground defense line" for railway drainage projects.

From the underground drainage of urban subways to the bottom of the track of heavy-duty railways, HDPE carat pipes are silently guarding the safety and smooth flow of traffic arteries with their excellent performance. It is not only the "guardian" of the drainage system, but also the "bridge" connecting transportation and the environment, so that the railway can achieve long-term stable operation of the drainage system while efficient transportation, and lay a solid foundation for the construction of a transportation power.