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M30 Tunnel Segment Bolts for Tianjin Rail Transit Line 6

In 2014, Anyang Railway Equipment Co., Ltd(AT) provided M30 Tunnel Segment Bolts for Tianjin Rail Transit Line 6.

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Tianjin Rail Transit Line 6 has a total length of 56.13 km, including 43.5 km of underground lines and 1.5 km of underground lines.

In 2014, Anyang Railway Equipment Co., Ltd(AT) provided M30 Tunnel Segment Bolts for Tianjin Rail Transit Line 6.

  1. The segment connection bolts are made of 45#steel, and the surface of the bolts is treated with zinc chrome coating to prevent rust. The zinc chrome coating meets the requirements of “Specifications of Zinc/Chromate Coatings” (GB/T18684-2002), and the protection level is not lower than 9 after the 480h neutral salt spray test. The mechanical properties of the ring tunnel bolts are grade 5.8.
  2. The mechanical properties of the circumferential bolts and nuts and the longitudinal bolts and nuts are both grade 5.
  3. The flat washer and nut are made of 45# steel, and the chemical composition and mechanical properties of the material meet the requirements of GB/T 699.
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