Maintenance methods for subway bolts:
The conventional curing method for subway bolts is atmospheric-pressure steam curing, which typically involves four stages: pre-curing (Y), temperature rise (S), constant-temperature curing (H), and cooling.
Currently, the main issues with the steam-curing process for metro tunnel segments include: insufficient heat exchange within the curing chamber during heating, which can easily lead to non-uniform heating across different parts of large segments; low steam energy utilization and high energy consumption; and the common practice of linear temperature rise during steam curing—i.e., increasing the temperature at a fixed rate until the target temperature is reached—which results in prolonged curing times.
Steam curing of subway bolts is a method that uses an external heat source to heat concrete, thereby accelerating the cement hydration reaction and the development of its internal microstructure. The primary objectives are to shorten formwork turnover time and increase production output.
Metro bolted segmental lining is a type of precast concrete lining—typically composed of multiple segments assembled into a ring—and is primarily used in the construction of metro tunnels and large sewage pipelines. During tunnel excavation, the segments serve mainly to provide structural support and waterproofing.
Ensuring that the assembled tunnel segments are perfectly circular and maintain this circularity is crucial for guaranteeing tunnel dimensional accuracy, accelerating construction progress, enhancing water-tightness, and minimizing ground settlement.
We have established deep expertise in the rail infrastructure equipment sector, with our core product portfolio encompassing high-strength hot-dip galvanized bolts, drilled bolts, pins, nuts, and accompanying flat and spring washers—key fasteners for critical connections. We also offer custom manufacturing of a wide range of non-standard hot-dip galvanized products tailored to specific customer requirements. All our products are made from premium-grade materials, undergo precision machining, and are subject to rigorous quality inspections, ensuring stable mechanical performance, superior corrosion resistance, and long-lasting durability—fully meeting the stringent standards of the railway industry.
Leveraging outstanding product quality and professional technical services, the company’s products have been successfully deployed in numerous key railway electrification projects, track fastening systems, and clean energy initiatives both domestically and internationally, providing long-term supply support to many large-scale power equipment manufacturers. Looking ahead, Nantong Longyu will continue to be driven by technological innovation and guided by customer needs, thereby making a solid contribution to the global development of rail transit.
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Fish-tail rail bolt
We have established deep expertise in the rail infrastructure equipment sector, with our core product portfolio encompassing high-strength hot-dip galvanized bolts, drilled bolts, pins, nuts, and accompanying flat and spring washers—key fasteners for critical connections. We also offer custom manufacturing of a wide range of non-standard hot-dip galvanized products tailored to specific customer requirements. All our products are made from premium-grade materials, undergo precision machining, and are subject to rigorous quality inspections, ensuring stable mechanical performance, superior corrosion resistance, and long-lasting durability—fully meeting the stringent standards of the railway industry.
Leveraging outstanding product quality and professional technical services, the company’s products have been successfully deployed in numerous key railway electrification projects, track fastening systems, and clean energy initiatives both domestically and internationally, providing long-term supply support to many large-scale power equipment manufacturers. Looking ahead, Nantong Longyu will continue to be driven by technological innovation and guided by customer needs, thereby making a solid contribution to the global development of rail transit.
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Nantong Longyu Rail Equipment Co., Ltd.
Contact: General Manager Wu
Address: No. 1, Xinning West Road, Group 6, Ningtong Residence, Jiang’an Town, Rugao City, Jiangsu Province
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