On October 10, 2023, the main bearing of a 8.61 meter diameter shield tunneling machine developed by ZHTJ was successfully taken offline. This is the largest, heaviest, and highest load-bearing integrated shield tunneling machine main bearing in the world to date.
This set of main bearings can be used to drive an 18 meter ultra large diameter shield tunneling machine. The product weighs 62 tons and is circular in shape, capable of withstanding loads of over 10,000 tons; In a raceway plane with a diameter of over 8 meters, the flatness requirement is less than 20 micrometers, making manufacturing extremely difficult.