Home » PC STRAND News » 【Product Application】|Application And Characteristics of Prestressed Steel Strand Products in The Yarlung Tsangpo Hydropower Station! Construction Commenced on July 19, 2025!
【Product Application】|Application And Characteristics of Prestressed Steel Strand Products in The Yarlung Tsangpo Hydropower Station! Construction Commenced on July 19, 2025!
Views: 0 Author: Site Editor Publish Time: 2025-07-25 Origin: Site
The Yarlung Tsangpo River Lower Reach Hydropower Project officially commenced construction on July 19, 2025. As a super-scale engineering project of unprecedented global magnitude (with a total investment of approximately 1.2 trillion yuan and an installed capacity of 60 GW), it imposes extreme demands on construction materials under the complex geological conditions of the plateau. Prestressed steel strands have emerged as one of the key technological supports for the project. This product, with its high strength, corrosion resistance, and fatigue resistance, is widely applied in the core phases of the project to meet seismic resistance, pressure resistance, and long-term stability requirements. The following sections provide detailed descriptions of its application scenarios, technical requirements, and product types.
1. Application Scenarios and Functions Tunnel Support and Reinforcement: The project involves the construction of an ultra-long water diversion tunnel spanning 50 kilometers, crossing 17 geological fault zones and a 9-degree seismic zone. Prestressed steel strands serve as the “invisible skeleton” of the support system, reinforcing the tunnel walls to prevent rock bursts and cave-ins.Dam Anchoring and Dam Structure: In the “flexible dam body” design (capable of withstanding an 8.5-magnitude earthquake), steel strands are used to anchor critical sections of the dam body, enhancing its overall seismic resistance.Water Supply Pipeline Reinforcement (PCCP Pipe Application): Water supply pipelines must withstand extreme pressures of up to 235 atmospheres. Prestressed steel strands are embedded within PCCP pipes (prestressed concrete cylinder pipes) to provide high-strength support, ensuring the pipeline's under high-pressure conditions.Anchoring of new energy infrastructure: In the water supply systems and hydropower facilities to the project, steel strands are used to anchor structures such as offshore wind turbine foundations, enhancing overall stability. 2. Product Types and Technical CharacteristicsUltra-high-strength steel strands: Utilizing 2200-2400 MPa strength specifications (over 40% higher than traditional products), these strands offer excellent tensile strength and fatigue life, capable of withstanding high-stress geological environments and millions of cyclic loads.For example, non-adhesive galvanized steel strands have been applied in projects such as the Pearl River Delta Water Resources Allocation Project. Through a dual-layer corrosion-resistant structure (such as galvanization treatment), corrosion resistance is enhanced to a service life of over 50 years, making it suitable for high-altitude environments with strong ultraviolet radiation and large temperature fluctuations.PCCP pipe steel wire: Specifically designed for water supply pipelines, it is embedded in steel-reinforced concrete pipes to provide core compressive support. As the industry standard drafter, its products can withstand 235 atmospheres of pressure and have passed salt spray tests to verify their corrosion resistance.Smart monitoring integration: Some steel wires are embedded with fiber optic grating sensors to enable real-time stress and strain monitoring (with over 90% accuracy), used for early warning of rock bursts and structural deformation. 3. Technical Challenges and Engineering RequirementsExtreme Environment Adaptability: The product must meet reliability requirements in high-altitude environments (such as above 2,000 meters), seismic zones, and high-pressure environments. This is achieved through seismic-resistant design (e.g., withstanding a magnitude 9 earthquake) and corrosion-resistant reinforcement (double-layer structure) to ensure safety.Large-Scale Demand: The project scale is equivalent to three times that of the Three Gorges Project, with an estimated steel strand usage exceeding 100,000 tons, driving the supply chain toward high-value-added directions such as 2400 MPa-grade high-strength steel strands.Material Innovation: The application of nickel-based high-temperature alloys and high-strength steel strands (such as 2400 MPa-grade) accelerates the industrialization of specialty materials and enhances overall project efficiency.
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