Shanghai airport contact line "new crossing" shield machine offline

On July 30, the "new Crossing" shield machine of Shanghai airport connection line rolled off the production line in Changsha. It will be shipped to the site for assembly and put into use, marking another step in the control project excavation of Shanghai's first municipal railway line.

The new Crossing machine is 114 meters long and weighs about 3,174 tons. The cutters are painted with magnolia, the city flower of Shanghai, which not only has the regional cultural characteristics of Shanghai, but also symbolizes the spirit of pioneering and striving for progress.

With a total length of 68.68 kilometers and a "Y" shaped structure, the Shanghai Airport Connection line has 9 stations and a design speed of 160 kilometers per hour. It is one of the first 11 municipal railway demonstration lines confirmed by the National Development and Reform Commission, and also an important east-west fast passage in the Shanghai rail transit network.

Learned, by building construction of Shanghai airport link 2 blocks of shield tunnel length 4939.7 meters, the segment outside diameter 13.6 meters, is the first long distance small spacing parallel operation high rail line of maximum diameter of shield tunnel, is also the Chinese railway construction in Shanghai is responsible for the construction of the first large shield tunnel, tunnel structure is adopted for its innovative total prefabricated construction, Also created a similar construction process of the first.

Shield tunnels pass through important buildings (structures) such as operational rail transit, municipal roads and Bridges, which require high precision of surface settlement control and environmental protection. The large arc block at the bottom of the tunnel is constructed by integral prefabrication for the first time, which requires high reliability of material transportation system and assembly accuracy. Long distance and large section through silty clay, sandy silt, silty sand formation, the shield machine attitude control, overall sealing performance and construction are also put forward higher requirements.

According to the characteristics of the engineering and project requirements, shield machine specific configuration in the design of the cutter, high atmospheric soft soil pressure on the main drive seal, big flow mud flushing circulation system, high-precision gas liquid pressure balance control system and efficient material handling and high precision synchronization technology, box culvert wall after a number of key technologies, such as synchronous grouting compactness detection system It greatly improves the adaptability and reliability of the shield machine, and escorts the smooth implementation of the project.