New Breakthrough, Successful Application of the First Domestic Composite Caisson Shaft Tunnel Boring Machine of China Railway Construction Heavy Industry

Recently，Led by Guangzhou Metro Group，China Railway Construction Heavy Industry and Guangzhou Metro Design Institute、CRCC South China Construction、China Railway 15th Bureau、Many units, such as Sun Yat-sen University, undertook the project of unveiling the list in Guangzhou.“Development and Application of Complete Equipment for Underground Engineering of Rail Transit in Complex Environment”Once again ushered in a breakthrough，Successful Development and Application of the First Domestic Composite Caisson Shaft Machine，It marks the successful completion of the first phase of the scientific research task of the project.，Achieve important practical results。

The First Domestic Composite Caisson Shaft Machine“The future”Construction site

It is reported that，The First Domestic Composite Caisson Shaft Machine“The future”No.2 Shield Shaft between Jingxi Road and Baiyun Dongping Section of Guanghua Intercity Railway（Hereinafter referred to as Jingbai No.2 Well）Complete the double-well tunneling task，It marks the successful verification of the first vertical mechanical shaft construction technology applied in the field of rail transit construction in China.，China's Rail Transit Shield Shaft Construction Enters a New Era of Mechanical Construction。This construction method adopts the excavation process without drainage in the well.，And greatly reduce that cost of the enclosing structure.，And that influence on the surround environment is reduced.，At the same time, it realizes underground unmanned ground operation with few people.，Greatly improve the safety of shaft construction。

Jingbai No.2 Well Segment Outer Diameter 14m，The inner diameter is 13 meters，Depth 37.2 meters。This time, the shaft Boring Machine passes through the backfill in turn、Silty fine sand、Silty clay、Sandy cohesive soil、Completely weathered granite、Strongly weathered granite、Moderately weathered granite、Slightly weathered granite formation，It belongs to the typical composite strata in South China.，There are a large number of boulders and unfavorable geology such as large undulation of rock surface.，At the same time, groundwater is abundant，Extremely high requirements for equipment reliability，The construction is extremely difficult。

“The future”Aerial map of construction

For high water pressure、High hardness、Big boulder、Difficult problems such as large undulation of rock surface，The R & D team of China Railway Construction Heavy Industry Co., Ltd. has conducted extensive research、Fully studied，Through theoretical model analysis、Technical demonstration and other methods，The equipment is designed pertinently.。On the basis of the completion of the construction of the right line shaft，Summarize the experience，Optimize and improve the equipment and construction technology，It improves the adaptability and tunneling efficiency of the equipment in hard rock and boulder strata.，It took only 34 days to complete the construction of the left line shaft.。

China Railway Construction Heavy Industry Co., Ltd. has overcome difficulties in the development of shaft Boring Machine、Continuous innovation，Another heavy weapon of a big country——The world's largest shaft Boring Machine with a diameter of 23 meters“Dream”It is entering the critical stage of site assembly and commissioning.，It's about to start，It will create brilliance again in the field of urban mechanical shaft construction.！

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