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The environmental adaptability of underground pipes refers to their ability to withstand various natural conditions, especially the characteristics of the surrounding soil. In regions with favorable soil conditions, such as the eastern part of the country, FRP (Fiberglass Reinforced Plastic) sand pipes have proven to be highly suitable. This has been demonstrated through real-world applications. For example, glass fiber reinforced plastic sand pipes installed in areas like Daqing, Beijing, Shishi, and Huludao have been in service for many years without issues.
However, in areas with collapsible loess soil, which can rapidly lose structural integrity when exposed to water, special care is required. Collapsible loess tends to settle significantly under its own weight or additional loads, making it unsuitable for direct pipe installation without prior foundation treatment. Common methods to address this include tamping, soil cushion compaction, lime soil stabilization, and concrete paving. The choice of method depends on the degree of collapsibility and the load the pipe will bear. Lighter pipes, such as FRP sand pipes, can often be handled with simpler and more cost-effective techniques because their lighter weight reduces the external stress on the soil.
This makes FRP sand pipes not only more adaptable but also more stable and safe, especially in challenging soil conditions. From an economic perspective, FRP sand pipes offer significant advantages. They are lightweight, have a smooth inner surface, resist corrosion, and feature a low friction coefficient. These properties make them easier to transport and install, reducing labor and logistical costs.
Although the initial unit price of FRP sand pipes may be higher than that of other materials, their long-term cost-effectiveness becomes evident when considering the entire lifecycle—installation, operation, and maintenance. The low specific gravity of FRP pipes means that even though they may cost more per unit, their overall weight is much less than that of traditional pipes, leading to comparable total costs.
Additionally, FRP sand pipes eliminate the need for costly anti-corrosion treatments. Unlike steel, cast iron, or cement pipes, which require internal and external coatings to prevent degradation, FRP pipes are manufactured with built-in corrosion resistance. This not only saves on maintenance and repair costs but also ensures a smooth, clean inner surface throughout the pipe's lifespan. As a result, the friction coefficient remains consistent, ensuring efficient and reliable fluid transportation without the need for ongoing maintenance.