Steel sleeve steel fixed section (reinforced fixed) takes advantage of the high strength and good sealing properties of steel sleeve pipes, successfully addressing the difficulties of waterproofing and leakage prevention. The outer protective layer made of steel pipes features high strength, resistance to damage, and the ability to bear loads from above the sleeve, necessitating anti-corrosion treatment for the steel outer casing to ensure long life. This guarantees the properties of heating pipelines and allows for wider application in various temperature environments, particularly suitable for high-temperature steam pipeline projects. The sliding supports and internal fixations in steam pipelines use special insulation materials to prevent the formation of thermal bridges, thus controlling the temperature of the outer anti-corrosion layer. The fiber-reinforced glass steel outer casing has good rigidity and waterproofing properties, with excellent corrosion resistance to adapt to various complex soil environments. Anti-corrosion for the outer steel pipes can be achieved through a combination of anti-corrosion coatings and cathodic protection, significantly increasing the lifespan of the anti-corrosion. The drainage system employs a fully enclosed design, with flexible layout and a reasonable structure, ensuring reliability. Field joint insulation for steel sleeve steel thermal insulation pipes must be carried out only after passing a pressure test; this is a unique aspect of prefabricated buried thermal insulation pipeline construction, as the quality of this work directly affects service life. Suitable for insulation and cooling projects transporting various media within the range of -50℃ to 150℃, it is widely used in industries such as urban centralized heating, greenhouses, cold storage, coal mines, oil ports, chemical industries, and more. Polyurethane rigid foam thermal insulation materials for the construction industry are an important branch of the polyurethane industry, characterized by their versatility, offering insulation and waterproofing functions. Since their application in European construction industry since the 1960s, these products have a 40-year history, and some have even been legislated as building insulation and waterproofing materials. In recent years, with the rapid development of China's building energy-saving market, polyurethane rigid foam thermal insulation products have been widely used in the field of building insulation and waterproofing, becoming the dominant market for thermal insulation.