November twenty ninth，The world's largest shaft boring machine jointly built by China Railway Construction Heavy Industry and China Railway 15th Bureau“Dream”Offline in Changsha, Hunan。“Dream”The whole machine is about 10 meters high.，Excavation diameter up to 23.02 meters，It is the largest excavator in the world so far.，It fills in the blank of roadheader product spectrum in the world.，It marks a new step in tackling key scientific and technological problems of underground engineering equipment in China.。

The world's largest shaft boring machine“Dream”Offline site

“Dream”Site construction simulation

Party Secretary of China Railway 15th Bureau、 Chairman Huang Changfu's online speech

Secretary of the Party Committee of China Railway Construction Heavy Industry、Chairman Liu Feixiang delivered a speech on the spot.

Speech by Qi Wenrui, General Manager of Urban Rail Transit Company of China Railway 15th Bureau

Deputy Secretary of the Party Committee of Railway Construction Heavy Industry、He Yongjun, chairman of the trade union, presided over the offline ceremony

“Dream”Set excavation、Slag tapping、Support、Guidance and other functions are integrated.，It is suitable for the construction of ultra-large diameter shaft engineering in soft soil and soft rock strata.，The overall technology has reached the international advanced level.。The equipment is fully sealed.、High pressure bearing design，During construction operation，The main engine dived into the water to excavate and borrow soil，The maximum excavation depth can reach 80 meters.，At the same time, it has the ability of variable diameter excavation.，Will participate in the construction of underground intelligent garage in Jing'an District, Shanghai。

In recent years，Speeding up the Construction of Sponge Cities、Underground smart garage and other livelihood projects，Extra large diameter、There are more and more ultra-deep shaft projects。Before，Domestic and foreign enterprises have developed shaft boring machines with excavation diameters of 13 to 14 meters.，Used for construction of mechanized open caisson engineering，However, it is the first time in the world to develop a super-large diameter shaft boring machine with an excavation diameter of 15 meters or more.。

In order to meet the needs of super-large diameter excavation，At the same time, the efficiency of shaft excavation is ensured.，The R & D team of Railway Construction Heavy Industry has broken through the design technology of complete set of mechanical caisson equipment for super-large diameter shaft.，The reliability of the underwater environment construction of the equipment is strengthened.，The problem that the sinking attitude of the traditional open caisson is difficult to control is solved.。Compared with the traditional open caisson construction method of manual excavation,，“Dream”Mechanized open caisson operation can realize unmanned underground、There are few people on the ground，Reach the well builder“To drill a well without going down”The goal of，Construction cost savings 50%Above，Effectively improve the safety of construction operations。

It is reported that，The underground intelligent garage in Jing'an District of Shanghai covers an area of 286 square meters.，The underground area is 1408 square meters，There are 19 floors，It is planned to build two buildings with a diameter of 23 meters.、Deep foundation pit shaft with a buried depth of 53 meters，152 mechanical parking spaces for each well，The ground is the garage access floor and equipment room.，After completion, it will become the world's largest diameter vertical underground intelligent parking garage.。