1.2. Engineering overview
1.2. 1 Overview of the whole line
Yiwan Railway starts from Huayan Station of Yayi Railway in the east and ends at Wanzhou Station of Dawan Railway in the west. The line is basically east-west, with a total length of about 377 kilometers. The eastern end leads from the western end of Huayan Station, crosses the Yangtze River in the middle and upper part of Rouzhiba sandbar in Wujiagang, Yichang City, passes through Dianjun and Tucheng on the left bank of Danshui to Hejiaping, passes through Baozhen Tunnel, passes through the left bank of Lang Ping to Lang Ping, passes through Baziling and Laiwenzhai Tunnel, passes through Yesanguan Tunnel, passes through Zhijing River, passes through Dazhiping Tunnel, passes through Yesanhe to Gaoping, and passes through Qingjiang River along Enshi Station 3654333. Go west through Wuliang and Wang Ying, pass Qiyue Mountain Range, enter Wanzhou District of Chongqing, pass Luotian, Shuanghe, Youshaba, Ganziyuan and Wuqiao, and cross the Yangtze River to Wanzhou Station in Wuqiao District.
1.2.2. Overview of bidding part
The first bid section is located in Grain Rain Township and Shuangliu Township, Wanzhou District, Chongqing, with a starting mileage of DK389+550 and an ending mileage of DK400+6 13.64. The total length of the line is 10.479km, and the main projects include Grain Rain Station (reserved), Yeyabang Bridge, Yibuhe Bridge, Dalongxi 2# Bridge and Cai.
1.3. Technical standards
1.3. 1. Main railway technical standards
Main technical standards of Yiwan line:
Railway grade: Grade I;
Number of main lines: single-line and double-line conditions are reserved for Yichang-Wuliang section;
Maximum gradient: 9 ‰; Jialipo18 ‰;
Minimum curve radius: 160km/h section (Yichang east to Liangwu) is generally 2000m, and 1600 m is more difficult; 120km/h (from Wuliang to Wanzhou) is generally 1200m, which is 800m.
Effective length of arrival and departure lines: 850m for single machine and 880 m for double machines;
Traction type: electric power;
Traction mass: 3,500 tons; ;
Block type: automatic inter-station block;
Locomotive types: tentative passenger car SS9 and freight car SS4.
1.3.2. Technical standard:
The current design, construction and acceptance specifications, procedures and standards of the state and the Ministry of Railways, as well as the bidding documents, design documents and materials of Yiwan Railway.
1.4. Project scale and number of major projects
The first bid section is located in Grain Rain Township and Shuangliu Township, Wanzhou District, Chongqing, with a starting mileage of DK389+550 and an ending mileage of DK400+6 13.64, with a total length of 10.479km.
The main works include subgrade earthwork: 33587m3, main track laying 10.539km, 4 tunnels, 3 bridges, 2 culverts, reserved stations 1 seat and other operating production equipment and buildings.
Caijiashan Tunnel: The entrance mileage of the tunnel is DK398+424, the exit mileage is DK400+020, and the total length of the tunnel is 1596m, which is a single-track tunnel;
Tiziyan Tunnel: tunnel entrance mileage DK395+687, tunnel exit mileage DK397+9 18, tunnel total length 223 1m, single-track tunnel;
Zhangjiaping Tunnel: The entrance mileage of the tunnel is DK392+480, the exit mileage is DK395+096, and the total length of the tunnel is 26 16m, which is a single-track tunnel;
Daziping Tunnel: The entrance mileage of the tunnel is DK390+025, the exit mileage is DK392+4 13, and the total length of the tunnel is 2388m, which is a single-track tunnel;
Yeyabang Extra Large Bridge: The central mileage of the bridge is DK395+389.77, with a total length of 585.40m The superstructure is 1-24m+6-32m post-tensioned beam +(48+80+48)m continuous beam +4-32m +2-24m post-tensioned beam;