Segment assembly method for metro tunnel bolts:
Metro bolted wedge-type segment installation method: A hydraulic jack capable of axially pushing the adjacent segment outward to enlarge the insertion space.
Practical operation of the metro bolt-driven hydraulic jacks: It is crucial to extend and retract the hydraulic jacks in accordance with the segment-assembly sequence.
Method for assembling subway bolts into rings: jointed seam assembly.
Re-tightening of subway bolted connections: Ensure radial connection bolts are fully tightened.
The assembly sequence for metro tunnel segments is as follows: standard (Type A) segment—standard segment—adjacent (Type B) segment—wedge-shaped (Type K) segment.
Metro bolt tightening for connection bolts: first tighten the circumferential (mid-section of the segment) connection bolts, then tighten the radial (between adjacent segments) connection bolts.
Metro bolted joint bolts: First tighten the circumferential (between segment joints) connection bolts, then tighten the axial (between ring joints) connection bolts. 5. Installation method for wedge-shaped segments: Equip with jacks capable of radially outward pushing adjacent segments to increase the insertion space.
Metro bolt assembly sequence: lower standard (Type A) segment—standard segment—adjacent (Type B) segment—wedge (Type K) segment.
Operation of metro bolted shield tunneling jacks: It is crucial to retract the shield tunneling jacks in sequence as the tunnel segments are assembled.
Re-tightening of subway bolted connections: Ensure that the axial connection bolts are fully tightened.
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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Four-way track 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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