The first large-diameter mud-water balance shield machine "jiangpu" made in China started smoothly

Shanghai, Aug. 24 (xinhua) -- the first domestically made large-diameter mud and water balance shield machine "jiangpu" entered Shanghai on Aug. 24 and started its construction smoothly. This equipment is jointly developed by China railway construction heavy industry and Shanghai foundation company, and has completely independent intellectual property rights. The excavation diameter of the equipment reaches 11.63m, the total weight is about 1900t, and the installed power is 3661kW.

Learned, Shanghai road, jiangpu roas tunnel is one of the major municipal engineering in Shanghai during the "much starker choices-and graver consequences-in, tunnel overall assumes the north-south, north the yangpu district longjiang road, jiangpu road, to shield way across the huangpu river, south to minsheng road, mall road pudong new area, the total length of 2.28 km, including shield segment length of 770 m, four lanes. The project was constructed by Shanghai chengtou highway investment (group) co., LTD., and the general contractor was Shanghai construction engineering group co., LTD.

Shanghai jiangpu road cross the huangpu river under the tunnel, has the characteristics of large excavation section, complex hydrogeological conditions, large change of overburden thickness, high permeability coefficient. The tunnel crosses soft soil layers such as silty soil and sandy soil for a long distance. The minimum covering thickness of the tunnel in the middle section of the river is only 7m, which brings great challenges to the attitude control, cutting head and construction of shield machine.

In view of the weak stratum in the engineering, CRCC optimizes the structure of the cutter disc and the configuration of the cutter. The main drive adopts high-pressure polyurethane seal with a bearing capacity of 10bar, which reduces the construction consumption and improves the adaptability and economy of the equipment. In addition, the equipment innovatively designs a material transportation system with tube segments and box culverts working together with common rail lifting, which not only guarantees the reliability of material transportation, but also improves the adaptability of the supporting trolley to ultra-high box culverts and restricted starting space.

According to the introduction of the project construction unit, jiangpu road crossing the river tunnel project in response to the national call to support the "big country heavy machine", this shield machine compared to the original Shanghai renmin road crossing the river tunnel, longyao road crossing the river tunnel used in the promotion of the whole import shield machine, no matter from the thrust, torque, degree of automation are better.

Shanghai jiangpu road cross-river tunnel is scheduled to be completed and open to traffic in 2020. After completion, it will meet the needs of the northern region of Shanghai to cross the river, support the development of the riverside area, and promote the integration of the two sides of the huangpu river.