China's independently develope shield machine with that largest diameter
November 01, 2024
October 31，Maximum excavation diameter of one set is up to 16.The 64-meter super-large diameter Shield Machine was launched in Changsha, Hunan Province.，It will be applied to the longest underwater shield tunnel in the world.——Construction of Haitai Changjiang Tunnel，This isThe largest diameter Shield Machine independently developed in China so far，It marks a new breakthrough in the industrialization of domestic super-large diameter Shield Machines.。
This shield machine is named“Jiang Hai Hao”，By China Railway Construction Heavy Industries、China Railway 14th Bureau、Jointly built by the Fourth Railway Institute，The whole machine is about 145 meters long.，The total weight is about 5000 tons。“Jiang Hai Hao”It is the Haitai Yangtze River Tunnel Project that crosses the Yangtze River.、Two Intention Fusion Names Adjacent to the Sea，Its cutterhead is painted with a huge blue wave that strikes forward.，Implies that the shield machine will concentrate on sneaking.、Access to rivers and seas。
Haitai Yangtze River Tunnel is located in the estuary area of the Yangtze River in Jiangsu Province.，From Nantong Haimen District in the north，South to Taicang City, Suzhou。Total length of the project line: 39.07 kilometers，The length of the river-crossing tunnel is 11.185 kilometers，Adopt the design standard of two-way six-lane expressway，The design speed is 100 kilometers per hour。The shield tunnel section is 9315 meters long.，Maximum excavation diameter up to 16.64 meters，Complex geological zones such as compound stratum of muddy silty clay with silty soil and silty fine sand shall be crossed along the line.，The maximum buried depth is about 75 meters.，Maximum water pressure up to 7.5 bar，It has a very long distance、Extra large diameter、Super high water pressure、Super deep burial、Complex working conditions and the like.。
Equipment preview animation“Jiang Hai Hao”It will complete ultra-long distance single-head tunneling under the Yangtze River.，Especially when crossing the Yangtze River and the levees on both sides.，The settlement shall be controlled within 1 cm.，The construction is difficult，And the area covered by geological exploration in the middle of the river is limited.，There are many uncontrollable unknown areas，As if“Cross the river by feeling the stones”。Super 16.The large diameter of 6 meters means that the cutter head of the shield machine needs a large torque for excavation.，Heavy load on main drive bearings；7.5 Bar Ultra High Water Pressure to Main Drive Seal、The bearing capacity of components such as shield tail seal is required to be high，While maintaining high performance load，How to ensure that the whole machine continuously excavates 9315 meters in the complex environment of the river bottom is the main challenge and difficulty faced by the research and development team.。In view of project construction risks and difficulties，The R & D team tackled key problems through innovation，At the cutter head tool、Targeted design is adopted for key components such as main drive.，It is equipped with soft soil cutter head with the function of changing cutters under normal pressure and large alloy.、High hardness、Wide coverage、Wear-resistant cutting tool，Telescopic function of main drive configuration，Capable of sensing the integral stress of the cutter head，Effectively avoid the overload of the main bearing caused by the abnormal stress of the cutter head under special circumstances.，Convenient tool changing operation、Assist the cutter head to get out of trouble，And configure a main drive state monitoring system，Continuous monitoring of the operation of the main drive。At the same time，Design the overall dimensions of the shield body according to local conditions、Structure thickness，Increase the cylinder size，Optimize mud circulation system and grouting system, etc.，And that performance of the whole machine is enhance，Intelligent assembly system for configuring segment connecting member，Meet the needs of engineering construction。
According to the introduction of the project preview animation，The development team also combines years of experience in underwater and large-diameter shield tunnel construction.，By increase that opening ratio of the cut head of the shield machine，Configure high pressure、Central scouring system with large flow and mud cake early warning system for cutter head，And is matched with a telescopic camera device.，The condition of the working area of the cutter head can be observed without personnel entering the cabin with pressure.，Ffectively distinguish and reduce that risk of the cutterhead caking mud cakes，Improve bottom slag discharge efficiency。At the same time, it also applies the fourth generation of synchronous injection of double-liquid slurry technology developed independently.，Realize millimeter-level precision control of shield tunnel settlement，Ensure construction safety and efficiency。
“Jiang Hai Hao”The shield machine is known，The industry usually refers to shield machines with a diameter of 14 meters or more as super-large diameter shield machines.。“Jiang Hai Hao”Is 16 in diameter.07 meters“Jinghua”After successful offline and application，Another super-large diameter shield machine independently developed by Chinese enterprises。“Jiang Hai Hao”Successfully offline，It marks a new leap forward in the development and application of 16-meter-class super-large diameter shield machine in China.，It has formed the industrialization development capability of the whole industry chain of super-large diameter shield machine.。
Haitai Yangtze River Tunnel《Layout Planning of the Yangtze River Trunk Passage（2020-2035）》And《Planning of Comprehensive Three-dimensional Transportation Corridor in the Yangtze River Economic Zone of Jiangsu Province》Focus on promoting construction projects，It's also Jiangsu“Fourteen five”Key River-Crossing Passage Projects，It is planned to be basically completed in 2028.。After completion，It can effectively divert the flow of Sutong Yangtze River Bridge.，To implement the national strategy of regional integration development in the Yangtze River Delta and the development of the Yangtze River Economic Zone，Optimize the layout of the Yangtze River trunk crossing channel，It is of great significance to promote the cross-river integration and development of urban agglomerations along the Yangtze River.。
