The winter in Shenyang is the most demanding "test room" for buried pipelines. Shenyang is located in the extremely cold northeast region, with long winters, extreme temperatures, and repeated freeze-thaw cycles, which are the most feared working conditions for buried plastic pipelines.

Severe cold: Ordinary PVC pipes are prone to brittle fracture at low temperatures, and even a collision during loading, unloading, and transportation may cause the gaps in the pipe wall to enlarge year by year during freeze-thaw cycles, ultimately leading to cracking and leakage.

Freeze thaw: Uneven accumulation caused by frozen soil expansion, long-term ground pressure load, and insufficient ring stiffness will lead to rupture.

Leakage: The leakage of drainage pipes will invade the foundation structure of the venue, directly affecting the quality of the ice surface and the safety of the event. Sealing is crucial.

Low temperature brittle fracture, freeze-thaw deformation, and interface leakage: These three keywords constitute the "special examination paper" for pipeline products in the Wangjiawan project.

The high impact resistant PVC-M double wall corrugated pipe is designed for severe cold, surpassing the national standard and meeting the higher requirements of T/CPPIA03-2022 group standard

Modified toughening, cracking low-temperature brittleness

Traditional PVC tends to be brittle and easily damaged by impact. By adding high-efficiency toughening agents to PVC resin and utilizing physical blending modification technology, a modified PVC blend raw material is formed, which can increase toughness to 2-3 times that of ordinary PVC-U without significantly reducing long-term strength. The sensitivity to damage of pipes is significantly reduced, transportation and loading and unloading are more resistant to bumps, trench backfilling is more resistant to sharp stones, and freeze-thaw compression can better "overcome hardness with softness", achieving material grade matching in colder areas like Shenyang.

This product complies with the group standards published by the China Plastics Processing Industry Association and developed with the participation of China National Chemical Corporation. Compared to conventional standards, upgrade the testing to an extremely cold environment of -10 ° C (TIR<10%). Low temperature can lead to a decrease in molecular activity and an increase in brittleness of materials. Exploring the test temperature to -10 ℃ means that the installation, backfilling, and full cycle impact resistance of the pipe in low-temperature winter environments have all passed standardized verification.

The foundation will settle, and the pipeline will follow suit

Optimizing the mechanical structure of corrugated pipes, coupled with pipe ring stiffness up to SN12.5, far higher than ordinary PVC-U (SN8), with strong external pressure bearing capacity, able to resist external soil pressure and vehicle loads; Combining the unique toughness characteristics of PVC-M material, it can buffer the stress caused by trace settlement of the foundation. Compared with concrete rigid pipelines, it will not directly break due to small displacement of the stratum, effectively preventing rainwater and sewage leakage from eroding the underground foundation and cooling layer of the ice field, and safeguarding the stability of the ice field floor structure.

Leakage often occurs at the interface, and the seal should be kept tight

The high impact resistant PVC-M double wall corrugated pipe adopts an R-shaped expanded plastic skeleton rubber ring socket connection. The rubber ring is embedded with a plastic reinforced skeleton, forming an integrated structure with the rubber ring, giving the rubber ring higher radial stiffness. It is not easy to deform and will not be overturned during on-site installation, effectively preventing interface loosening. The rubber ring is made of ethylene propylene diene monomer (EPDM), which is anti-aging and rust resistant. It is equipped with the rigid support of the built-in plastic framework, which makes the seal durable and reliable, structurally reduces the leakage risk of the pipe network during operation, and provides guarantee for the closed water acceptance before the winter break.

The rubber ring has been pre installed before leaving the factory, and on-site connection can be completed by simply inserting it, making construction convenient and efficient. The compatibility between pipe performance and interface technology provides complete technical conditions for the project to complete the closed water acceptance before the winter break and ensure the long-term stable operation of the pipeline network.

Since independent research and development in 2016, the high impact PVC-M double wall corrugated pipe has undergone years of operation and testing in numerous projects across the country. In Shanghai, it entered the supporting project of Hongqiao International Airport and withstood the high standard inspection that aviation hubs cannot afford to lose; In Xi'an, it extends into the underground road network of the Greater Xi'an Cultural and Sports Functional Zone, accompanying the construction of a new cultural and sports city; In Hanzhong, Shaanxi, it is hidden under the gardens of the Han Culture Expo Park, ensuring the drainage safety of cultural landmarks.

The high impact resistant PVC-M double wall corrugated pipe has delivered a reliable answer sheet that can withstand follow-up visits across regions and scenarios. In the future, the company will continue to provide more reliable pipeline products and system solutions around the pipeline network needs of municipal construction, major projects, and livelihood projects, providing basic guarantees for more key projects.