Steel-clad steel fixed section (reinforced fixation) utilizes the high strength and good sealing properties of steel sleeves to successfully address the challenges of waterproofing and leak prevention. The use of steel pipes as the outer protective layer offers high strength, resistance to damage, and the ability to bear loads above the sleeves. To achieve long life, anti-corrosion treatment of the steel outer sleeve is necessary, ensuring the integrity of the heating pipeline and allowing 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 materials for insulation measures to prevent the formation of thermal bridges, thereby controlling the temperature of the outer anti-corrosion layer. Fiberglass-reinforced plastic outer protective pipes have good rigidity and waterproof properties, and their excellent corrosion resistance allows them to adapt to various complex soil environments. The anti-corrosion of the outer steel pipes can be achieved by combining anti-corrosion coatings with cathodic protection, significantly increasing the lifespan of the anti-corrosion. The water drainage system uses a fully enclosed design, which is flexible in arrangement, structurally reasonable, and reliable. The thermal insulation at the site joints of steel-clad steel保温 pipes must be performed only after passing a pressure test, and the construction of site joint insulation. This aspect is unique to the construction of pre-fabricated buried thermal insulation pipelines and directly affects the service life. Suitable for insulation and temperature control projects for various media within the range of -50℃ to 150℃. It is widely used in insulation and temperature control projects in industries such as urban centralized heating, greenhouses, cold storage, coal mines, oil ports, chemical industry, etc. Polyurethane rigid foam thermal insulation materials used in the construction industry are an important branch of the polyurethane industry, characterized by their versatility, providing insulation and waterproofing functions simultaneously. Since their application in European construction industry since the 1960s, these products have a history of 40 years, with some even legislatively designated as thermal and waterproofing materials for construction. 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, and have become the dominant market for insulation materials.