December 2，China South-to-North Water Diversion Group Jianghan Water Network Construction and Development Co., Ltd.、China Railway 18th Bureau and China Railway Equipment Group Co., Ltd.Hard-rock tunnel boring machine with maximum diameter and single shield“Jianghan Pioneer”Launching ceremony，It was held at the site of Civil Construction and Metal Structure Mechanical and Electrical Installation Bid 4 of the Middle Route of South-to-North Water Diversion Project，It marks the official entry of the project of diverting water from the Yangtze River to supplement the Han River.TBMConstruction phase，It opens a new chapter in the history of water conservancy construction in China.。Wang Kai, deputy general manager of the group company, attended the launching ceremony.。

The water diversion project from the Yangtze River to the Hanjiang River is the follow-up water source project of the middle route of the South-to-North Water Diversion Project.，Connecting the Three Gorges Project and the South-to-North Water Diversion Project“The most important weapon of the country”，The Yangtze River water from the Three Gorges Reservoir will be transferred to the Hanjiang River downstream of the Danjiangkou Reservoir.。After the completion of the project，It can greatly improve the water supply capacity and water supply guarantee rate of the first phase of the middle line project.，Greatly improve the Hanjiang River Basin and regional water resources allocation capacity，And create conditions for realizing the long-term water diversion scale of the Hanjiwei Water Diversion Project.。Tunnel water conveyance is adopted for the whole line.，Total length of water transmission line 194.Seven kilometers，The average annual water diversion volume is 3.9 billion cubic meters.。Among，TBMTotal length of excavation section 127.Six kilometers，A total of 10 sets of 12 meters are used.TBMConstruction，6 sets provided by China Railway Equipment。

It started this time“Jianghan Pioneer”TBMExcavation diameter 12.23 meters，The length of the whole machine is 160 meters，It weighs 2800 tons，In order to cope with the high geostress of the engineering tunnel、High water pressure、High ground temperature、There are many faults、There is a lot of groundwater、There are many soft rock cave sections.“Three high and three more”Construction difficulties caused by complex geological conditions，China Railway Equipment carries a comprehensive geological prediction system for the equipment.、Tool wear and condition monitoring system、Shield card machine early warning and evaluation system, etc.，It can effectively deal with the large buried depth along the line.、High external water pressure、Mud burst and water gushed、Large deformation of soft rock and other problems。At the same time，The equipment also innovatively breaks through the synchronous pushing technology.，Tunnel excavation and segment assembly can be carried out simultaneously，Construction efficiency can be improved by 20%To 40%。

Since October 1，Since the equipment was assembled，The technical service team of China Railway Equipment works closely with the Owner.，Anchor assembly、Target of three major nodes of stepping and launching，Assemble superior forces，Solid promotionTBMFront shield、Middle Shield、Tail Shield、Cutterhead welding and trailer assembly work，Achieved the 12-meter class.TBMIt takes two months to complete the assembly of the whole machine.、Excellent results of debugging and stepping 838 meters。

 

“Jianghan Pioneer”Successfully initiated by，For domestic tunnel boring machine in long distance、The application of deep buried water diversion project provides a valuable practical example.。Next step，China Railway Equipment will concentrate its superior resources，Stick to it“Full life cycle”Management concepts and measures，Go all out to provide first-class technical support and service for the site，Escort the safe and smooth excavation of the project。