On March 18, 2020, in the Changsha Industrial Park of Tiejian Heavy Industry, workers are busy packing and loading. They will unpack the shield of an ultra-large diameter shield machine into 8 pieces. The disk is divided into five pieces, and the equipment has a diameter of 12.19 meters. It is a veritable "Big Mac". It will be transported by sea to Shanghai, Mumbai, India, and participate in the construction of the Mumbai coastal highway tunnel.

Keywords: construction machinery construction, construction machinery equipment, iron construction heavy industry

The total length of this shield machine is 80 meters, the total weight is 2,300 tons, the installed power is 7280 kilowatts, and it has a horizontal turning ability of 350 meters and a climbing ability of 50 ‰. The largest diameter shield machine in India has broken the monopoly of Western developed countries in the overseas market for large diameter shield machines.

It is understood that the Indian Mumbai Coastal Highway, which is constructed along the western coastline of the Mumbai in the Arabian Sea, has a total length of 30.7 kilometers and is an important highway project in India. The tunnel involved in the construction of this equipment is approximately 1920 meters in length and has complex construction geological conditions. It consists of basalt, breccia and shale composite formations. The maximum uniaxial compressive strength is up to 200 MPa, and the tunnel is buried deep.

In response to the complex geological characteristics of the local area, the Tiejian Heavy Industry design team tailor-made a compound cutter head with eight spokes and eight panels, which provides a strong guarantee for the long-distance and complicated formations. In order to cope with the problems that the cutter head mud cakes and the slurry outlet are blocked during the tunneling process, a large slag inlet is set in the center of the cutter head of the shield machine, and multiple mud flushing ports are provided to improve the slag flow. Sex. The shield machine is also specially equipped with a large 20-inch hob, which effectively improves the rock breaking capacity and service life of the cutter head.

Not long ago, Tiejian Heavy Industry has shipped 4 shield machines to Bangalore, India for the construction of local subway tunnels. It is reported that the Bangalore subway tunnel project faces the problems of high rock formation strength, a large number of solitary rocks and uneven soft and hard strata. Through targeted design of the shield tunneling machine, Tiejian Heavy Industry gave the "shield tunneling machine operation under extreme conditions" The "China Plan" effectively solved the construction problem of Bangalore subway tunnel construction, and also marked the beginning of the mass production of domestic brand shield machines for the South Asian subway market.

The successful delivery of this order shows that the Indian market fully affirms China Railway Construction's efficient design, production and quality control and services. After the equipment is used, it will greatly help the construction of local highway tunnels. It also fully proves that China Railway Construction has rich manufacturing experience and has won a greater advantage for the future development of the South Asian market. Editor / Zhao Jing