December 29，It is judged by academicians, experts and scientific and technological journalists.、Selected by Hunan Science and Technology Journalism Society in 2023“Top Ten Science and Technology News in Hunan”Announced in Changsha，China Railway Construction Heavy Industry Co., Ltd.。“The main bearing of the world's largest diameter shield machine is offline in Changsha.”“The world's first variable diameter inclined shaft rock tunnel boring machine‘Tianyue’Originating”And“The 50th Anniversary of Successful Research on Indica Hybrid Rice”“Changsha Strives to Build a Global R & D Center City”“Breakthrough in semiconductor technology in Hunan，Localization of research and development equipment”And other heavy news were selected together.。

2023“Top Ten Science and Technology News in Hunan”Screenshot

Railway Construction Heavy Industry，Zan 866

Main bearing of the world's largest diameter shield machine

Get off the line in Changsha

October 12，Independently developed by China Railway Construction Heavy Industry Co., Ltd..The main bearing of the 61-meter shield machine is offline in Changsha.，This is the largest diameter in the world so far.、The monomer is the heaviest、Main bearing of integral shield machine with the highest bearing capacity。

Once the news is released，“CCTV reported more than 12 times in a row”“More than 100 mainstream media platforms are linked.”“Weibo Hot Search No.3”“BThe whole station is popular.”……#The world's largest diameter shield machine main bearing independently developed by China Railway Construction Heavy Industry#The topic heat continues to rise.。

This set of main bearings can be used to drive the 18m super-large diameter shield machine.，The product weighs 62 tons.，Three storeys high，Capable of bearing over ten thousand tons of load；In the raceway plane with a diameter of more than 8 meters，Flatness less than 20 microns，It is no less difficult to make than to carve flowers on rice grains.。

Its successful development，It marks that the development and industrialization ability of domestic super-large diameter main bearings ranks among the world's leading level.，It means that the main bearing of the shield machine has been fully localized.，It has realized the full coverage of the main bearing of the domestic shield machine from small and medium diameter to super large diameter.。 

It is reported that，The main bearing of shield machine is listed in 35 items that restrict the development of China's industry.“Stuck in the neck”Key technologies，The whole industry chain of shield machine is independent.“The last link”。With 8.The main bearing of the 61-meter domestic super-large diameter shield machine rolled off the production line smoothly，Tiejian Heavy Industry has thoroughly conquered and independently mastered the design of the whole series of main bearings of shield machines.、Material to manufacturing、Key core technologies in the whole test process，So that the domestic shield machine has a full range of China“Heart”。

The world's first variable diameter inclined well

Rock tunnel boring machine“Tianyue”Originating

August 15，Independently developed by China Railway Construction Heavy Industry Co., Ltd., it can achieve 50°Super large inclination angle continuous climbing、6.The world's first variable diameter inclined shaft rock tunnel boring machine with variable diameter excavation from 5 meters to 8 meters“Tianyue”Originating，It fills in the blank of full-section mechanized construction of diversion tunnel with super-large slope and two-stage inclined shaft in the world.。

It is understood that，“Tianyue”The total length is 87 meters、Total weight about 900 tons，Initiated launching without guide platform、50-degree large-inclination crawl tunneling method from bottom to top，Realize 6 in the middle adit.5 to 8 m reducer，Finally, it drove out of the upper adit.，Two-stage diversion inclined shaft adit can be realized、Full-section continuous excavation of inclined shaft、Primary support one-step forming。

In view of the project construction difficulties，“Tianyue”The R & D team spent five years tackling key problems.，Initiatively put forward the compound anti-running system with large gradient，For the first time, it has conquered the ultra-small vertical curve turning with a radius of 50 meters.、Large-range reducing of large-section cutter head and shield body、Initiation without guide station、There are 8 technical problems in the industry, such as continuous slag tapping in complex processes.，Carry out slag tapping、Support、10 innovative tests such as maintenance and material transportation，So that that equipment can realize the flat hole efficiently、Continuous driving of inclined shaft，The applicability of the equipment to complex underground caverns is greatly enhanced.。