en.Wedoany.com Reported - On April 14, the hoisting operation for the stay ring of Unit 2 at the Kala Hydropower Station in Sichuan Province, China, was successfully completed. This marks a significant advancement in a key step of the station's electromechanical installation, providing solid support for achieving the station's construction goals.
The stay ring is a critical load-bearing component of a hydroelectric generating unit, essential for the unit's long-term stable operation. The hoisted stay ring has a total weight of 192 tons and a maximum diameter of nearly 12 meters. Due to transportation constraints, it was transported to the site in four sections, formed after assembly into a circle and welding. The construction team maintained strict quality control, achieving a first-time qualification rate of 99.90% for weld seam inspection. The flatness of the flange surfaces and the coaxiality of the upper and lower ring plates after welding both exceeded the equipment manufacturer's standard requirements. During the hoisting process, the project team used a Hexagon Leica Absolute Laser Tracker AT500 to precisely control the installation position, making new progress in laser alignment technology for large component hoisting. Simultaneously, void detection technology was applied to inspect the strength of the concrete piers supporting the stay ring, comprehensively ensuring installation quality and safety.
To ensure a safe and orderly hoisting process, the project team adhered to safety principles, conducted comprehensive inspections of the 500-ton bridge crane, lifting tools, and work area in advance, strictly implemented a three-level risk control system, and established a complete, full-chain safety assurance system.
The successful hoisting of the stay ring for Unit 2 has cleared obstacles for subsequent critical processes such as spiral case assembly and foundation ring installation, laying a solid foundation for the station to achieve its goal of having the first batch of units generate electricity simultaneously.
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