Chengdu Metro Line 7 is the sixth subway line in Chengdu, with a design speed of 80km/h and six A-cars. The project adopts BT construction mode with a total investment of 28.897 billion yuan. The construction is undertaken by China Railway Second Bureau and China Railway Eighth Bureau as the main contractors. 20 12, 10 and 15 were started, and 20 17 and 12 were completed and put into production. The line starts from the North Railway Station, passes through chenghua district, Jinjiang District, Wuhou District, Qingyang District and jinniu district, and ends at the North Railway Station in a circular direction. It adopts the organization mode of single-loop operation, and has the characteristics of "endless loop" and "internal and external loop operation" The total length of the line is 38.6 1km, and the total construction area is 16 1.9 1 10,000 square meters. It is located between the Second Ring Road and the Third Ring Road, with 3 1 station, underground double-decker depot and the largest underground double-decker parking lot in Asia. It is connected in series with Chengdu Railway Station, Chengdu East Railway Station, Chengdu South Railway Station and Taipingyuan Station.
During the construction of Chengdu Metro Line 7, all the participating units overcame the complex geology of crossing rivers, railways, existing buildings, strongly permeable sandy pebbles and pebbles, successfully solved the problems of reticulated pipelines, pressurized water mains and structural transformation of transfer stations in the construction of deep foundation pits, and completed all the contents of the project and put it into operation on schedule. It is the first subway loop with the longest line, the most stations and the most transfer stations in China. It has created a comprehensive development model of subway "track+property" and "track+landscape", and refreshed the new concept of simultaneous development of subway engineering and municipal facilities.
The project popularized and applied 10 and 45 items of ten new technologies in the construction industry, and won the "Sichuan New Technology Application Demonstration Project" of the whole project. Measures such as underground parking lot and vehicle depot, dry heat maintenance control system, automatic lighting system and renewable energy feedback absorption device are adopted to truly save land, energy, water, materials and environment. Twenty-eight technologies such as "replacing disc hob with high-pressure fluid jet grooving device" have been developed, and many problems such as shield sticking, eccentric wear and "mud cake" have been solved. Successfully crossed houses, rivers, high-speed railways, urban trunk roads and subway lines. The whole line won 172 awards at or above the provincial level, including excellent design award 1 1, 24 high-quality engineering awards, 65,438 scientific and technological achievement awards, 6 construction method awards1,62 patents, 32 QC achievements, 2 customer satisfaction projects and 2 new technology application demonstration projects.
With the theme of "city artery, colorful Rongcheng", the whole line fully absorbs Jinsha culture, myths and legends, ancient Shu civilization and other elements, and is divided into three levels according to artistic design: eight key art stations (Jinsha Museum Station, Taiping Garden Station, Polytechnic University Station, Sima Bridge Station, Yipin Tianxia Station, Lion Mountain Station, Southwest Jiaotong University Station and Jiulidi Station) and five art stations. At the same time, four colors of green, red, yellow and blue are used to correspond to the changes in spring, summer, autumn and winter, creating a beautiful landscape.
Chengdu Metro Line 7 and the existing eight subway lines meet to form a network, which opens a new era of "well+ring" network operation of Chengdu Metro. The transfer coefficient is increased from 1.3 to 2.0, and the average daily traffic of the network is 5 million, which is convenient for citizens to travel. It is a subway demonstration line that includes "green, technology and people's livelihood". In order to build "the most beautiful Chengdu", "the city of leisure" and "the city of leisure"