China exports the largest diameter shield machine in Europe

A 11-meter-diameter shield machine independently developed by China Railway Construction Heavy Industry Group was recently shipped at the Zhanghuayu Wharf in Shanghai, passing through the Pacific Ocean and the Arctic Ocean. It is expected to arrive in Moscow in November to participate in the Moscow Metro Third Ring Road. Construction. This is the largest diameter shield machine that China exports to Europe.

The 11-meter shield machine weighs 1,700 tons and is a veritable underground giant. It was named "Victory" by the Vice Mayor of Moscow, Marat Husnuulin. The construction tunnel of the shield machine is located on the banks of the Moscow River. The ground transportation is heavy and the building is dense. It needs to dig 3,000 meters continuously and cross the Moscow River with a large diameter section. The minimum horizontal turning radius is only 400 meters.

Chen Qingbin, an engineer of the Tiejian Heavy Industry Roadheader Research and Design Institute, said that the minimum horizontal turning radius of a large-diameter shield machine is more than 500 meters. By adding hinge and over-excavation functions to the main engine, supplemented by a floating support structure propulsion system, the whole machine has 300 The turning ability of the meter radius. In view of the extremely cold climate in Moscow in winter, the shield machine adopts a cold-proof design and can be boring normally in a low temperature environment of minus 30 °C.

In the geological adaptive design, the shield machine adopts a six-armed heavy-duty composite cutterhead structure with higher strength and rigidity, and is equipped with a 19-inch large-diameter heavy-duty hob, which can cope with rock formations, pebbles and other composite formations above 120 MPa. The R&D team also designed a high-pressure seal with a pressure of up to 60 meters, which can effectively cope with the challenges of complex formations. By carrying an efficient tool change system, the construction efficiency is improved and the tooling intensity is reduced.

As early as 2017, five 6-meter-diameter shield machines independently developed by China were exported to Europe to participate in the construction of the southwestern ring road of the Moscow Metro. Last winter, they dig 35 meters on the highest day in Moscow's extremely cold environment, creating the highest daily footage of Russian subway construction.

It is reported that due to the excellent performance of five 6-meter-diameter shield machines in Moscow subway construction, Moscow Metro owners added this 11-meter large-diameter shield machine purchase order at the beginning of this year. The construction of the Moscow Metro's third transfer ring line will connect all the subway lines that have been built and to be built in Moscow. After being opened to traffic, it can effectively alleviate the transportation load of the Moscow metro ring line. (This article comes from Tiejian Heavy Industry)