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Hangzhou Daily News (correspondent Wang Mei reporter Fang Zhang) Yesterday, there was good news in the industrial field in Hangzhou—two subway shield machine cutters manufactured by Xizi’s Hangguo Group will soon go out of the country and export to Japan. Kobe, used in subway projects. This means that the Hangguo Group has become the first company in the province to have the manufacturing capacity of shield cutters. In the face of the attractive "cheese" of Hangzhou Metro, Hangzhou enterprises have begun to flex their muscles and try their best.
The two subway shield cutters were jointly developed by Hangzhou Pan Group and Mitsubishi Heavy Industries of Japan. Yesterday, the reporter saw this huge shield machine cutter in the Hangzhou Boiler Group. The cutter head is 6 meters in diameter and looks like a huge "razor." This shield machine cutter is said to have a weight of 40 tons. The cutter head is equipped with a hob and a cutter. It is suitable for the composite geology where hard rock and soft soil coexist.
"Your technology is ok?" More than a year ago, when Xizi United Holdings and Mitsubishi Heavy Industries talked about cooperation, representatives of Mitsubishi Heavy Industries issued such doubts. After all, the manufacturing process of the shield machine is complicated and the added value of technology is high. At present, it is mainly produced by several companies such as Germany and Japan, and the highest price is up to 35 million US dollars.
It is understood that these shield machine cutters need to be welded with steel plates with a thickness of 70mm or more. The welding groove is large. How to control the welding deformation and the shrinkage of welding becomes the key to cold manufacturing. Secondly, the machining capacity of this project is very large, especially for the hobs, which must be precision machined by CNC machine tools. The hob installation positioning requirement is only 2mm, and the position accuracy of the cutter positioning hole is only 0.02mm. This positioning requirement is unimaginable in the manufacture of large-scale cold-worked products, even for foreign manufacturers whose shield manufacturing technology is already quite developed, the difficulty is also great.
However, this sturdy Hangzhou private enterprise has overcome all kinds of difficulties. After the unremitting efforts and technological innovation of both parties, it finally completed the manufacture of two composite shield cutters at the end of March this year.
Today, Xizi United has already targeted the upcoming Hangzhou subway project. Yang Jiansheng, chairman of the Hangguo Group, said that as an industrial enterprise in Hangzhou, the Hangguo Group is very keen to build a force for the subway construction in the hometown.
Experts predict that the shield machine is currently the most advanced tunnel excavation equipment in the world. With the acceleration of the construction of underground tunnels and rail transit in China, the demand for subway shield machines will be more than hundreds in the next ten years. This huge market “cheese†can reach one billion US dollars. However, for a long time, the domestic subway excavation projects are all foreign shields in the “support marketâ€, and foreign companies occupy the vast majority of the subway shield machine market.
Shen Linchong, chief engineer of Hangzhou Metro Group, said that the cutterhead is a very important machine on the shield machine. They are highly concerned about the development of the shield machine cutter of Hangguo Group. In particular, I hope that one or several enterprises in Hangzhou have the ability to build the Hangzhou subway. Provide a shield machine. Now that the Hangguo Group has such a start, they are very happy.
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Technically excellent subway construction equipment produced in Hangzhou will be exported to Japan.
Yesterday, Zhejiang's first subway shield cutterhead was unveiled at Hangzhou Pan Group, a subsidiary of Hangzhou Xizi Group. Shield is also called full-section tunnel boring machine, which is widely used in urban subway tunnel and railway road tunnel construction. The cutter head is an important part of the roadheader. The two composite shield cutters exported from Hangzhou Pan, up to 6 meters, are major projects in cooperation with Mitsubishi Heavy Industries of Japan and will be exported to Kobe, Japan for subway projects.