Ningbo digs the subway and uses the world's most cattle shield machine     

"Tuxing sun" at the earth as we all know, in our field of mechanical engineering is also a powerful "Tuxing sun", now this equipment is boosting the construction of Ningbo subway. This equipment is called "Yangming number", and in September 30th this year, the first class of rectangular shield machine "Yangming number" was developed in Shanghai.

The morning of November 30th, started at South Station wells upgraded version of "Tuxing sun" - the earth pressure balance shield machine type rectangular "Yangming" in the Ningbo Metro Line 3 project high Tong Bridge, it is the tunneling direction along the Hunan road in South Guangde planning planning four weft road block, then southwest under wear River work.

The equipment of rectangular shield China's first self-developed machine, shield machine originating first is the first phase project of line 3, the "big guy" section is 11.83 meters wide, 7.27 meters high, 58.6 meters in length and weighs about 770 tons, it set a world first, the world's largest section of the soil flat rectangular balance shield machine.

The underground space occupied by the ordinary version of "earth moving sun" shield machine is larger. The upgraded version of the "Tuxing sun" can avoid along more housing demolition, therefore affected residents will become less convenient for people's life and can work better and faster.

When the Yangming sign is started, a double track tunnel can be formed at one time, and the time limit for the tunnel is sure. In addition the rectangular shield construction method compared with the previous ordinary single circle shield construction, can make full use of the structural section, increase the use rate of the effective area, saving the resources of underground space; specifically, shield tunnel according to the design requirements, the two tunnel line spacing of about 13 to 15 meters, using a rectangular shield construction two, tunnel line spacing can be reduced to 5.1 meters. From the source, the distance between the shield tunnel side line and the house is increased, and the safety of the surrounding houses is ensured in the construction process of the tunnel section.

Experts said that when the rail lines across the city core area, on both sides of the narrow road, traffic, residential intensive, conventional single circle shield construction are more likely to have impact on the ground living, such as from the housing through the housing too close or below, involving housing demolition and protection difficulty cost will increase.

And Yang Ming occupied less places, to avoid more housing demolition along the line, the efficiency is also twice as common shield machine.

November 30th, class of rectangular shield machine ", first in advance of Yangming" line 3 phase engineering test, test range for the subway station to the Gaotang bridge between Jiang Shan depot. It will also put into application to Ningbo Metro Line 4 Qing Bridge station to cypress Road station this built-up area, the future plan is also used in No. 2 line two and line 5.