On December 29, new progress was made in the west extension of Chongqing Rail Transit Line 4, and the sixth TBM (full-section hard rock tunnel boring machine) - "New Journey" successfully started from the launch shaft of Huayuan Station and advanced to Longxi Station. This marks that the right line of Huayuan Station ~ Longxi Station has entered the excavation construction stage, and the construction of the entire project has been further accelerated.
The "New Journey" excavation section has a total length of 619.53 meters and mainly passes through sandstone and sandy mudstone. The section is a single-hole single-lane circular tunnel, with a minimum turning radius of 450 meters and a buried depth of 33.8~42.5 meters at the tunnel vault.
The "New Journey" is a composite EPB shield machine equipped by China Railway, with a total length of about 97 meters and a weight of 450 tons. The segmental lining ring has an inner diameter of 5900 mm, an outer diameter of 6600 mm, a thickness of 350 mm and a width of 1500 mm.
According to the project plan, a total of 7 TBMs will be used for the construction of the western extension of Line 4, and 6 TBMs have been successfully launched so far. It is worth mentioning that 3 sections of TBM have been successfully connected, including Longxi Station ~ Jiazhou Road Station, Jiazhou Road Station ~ Min'an Avenue Section, Yupan Departure Well ~ Panxi Station Section.
The west extension of Line 4 starts from Pangui Road Station in the west to Min'an Avenue Station (built) in the east, and will be operated through the first and second phases of Line 4 after completion, connecting important areas such as Dashiba Group, Guanyinqiao Group, North Railway Station, Tangjiatuo Group, Longxing Group, etc., to further encrypt the rail transit network in the central urban area and facilitate the travel of citizens.
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Photo: Peng Changhai
Editor: Fan Run
校对：刘 畅责编：苏 阳终审：胡潆兮
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