M27 Tunnel Segment Bolts for Xi’an Metro Line 8
In 2021, Anyang Railway Equipment Co., Ltd. will provide 79,720 sets of M27 circumferential seam segment bolts and 59,520 sets of M27 longitudinal seam segment bolts to Xi’an Metro Line 8.
Xi’an is located in Xi’an, Shaanxi Province, China. It is a “world-historical city”, one of the important birthplaces of Chinese civilization and the Chinese nation, and the starting point of the Silk Road–Xi’an is China’s best tourist destination and one of the best cities in China’s international image. Two of the six heritage sites are included in the “World Heritage List”.
The Xi’an Metro is serving the urban rail transit system in Xi’an, its first line opened for trial operation on September 16, 2011, making Xi’an the 14th city in mainland China with urban rail transit and the first in the northwestern region. 1 city with subways.
Till June 2021, there are 8 subway lines in operation in Xi’an, namely: Line 1, Line 2, Line 3, Line 4, Line 5, Line 6, Line 9, and Line 14. , All adopt the subway system with a total operating mileage of 258 km; a total of 154 stations, including 14 transfer stations.
Xi’an Metro Line 8 is the most important backbone line and transfer line in the metro network of the Guanzhong Plain urban agglomeration in China. It is also the only loop line in the planning of the Xi’an Metro network. Construction started on October 31, 2019. Xi’an Metro Line 8 has a total of 37 stations and 18 transfer stations, with a total length of about 49.896km, all of which are underground lines. ), which is the first unmanned smart subway operating in a loop in China.
In 2021, Anyang Railway Equipment Co., Ltd. will provide 79,720 sets of M27 circumferential seam segment bolts and 59,520 sets of M27 longitudinal seam segment bolts to Xi’an Metro Line 8. Circumferential seam connecting bolts and their connecting pairs 16 sets/ring, longitudinal seam connecting bolts and their connecting pairs 12 sets/ring, 1 connecting bolt + 1 nut + 2 washers = 1 set; the mechanical property level of the bolt is 8.8, The mechanical performance grade of the nut is 8.0, and the minimum mechanical performance grade of the washer is Hv=200; the bolts, nuts and washers are all made of zinc-based chromate anti-corrosion coating with a thickness of 6μm.
