China’s CRCC claims to have manufactured world’s biggest TBM main bearing
30 October 2023
Chinese construction company China Railway Construction Corporation (CRCC) claims to have produced the world’s biggest main bearing for a tunnel boring machine (TBM).
The bearing has a diameter of 8.61 metres, making it as tall as a three-storey building.
CRCC said it could be used to drive super-large-diameter TBMs of 18m in diameter and withstand over 10,000 tonnes of load.
It claimed that production of the bearing meant that China could stake its claim to be a world leader in the field of extra-large diameter main bearings.
In a statement, the company said, “CRCC’s project team has finally overcome manufacturing difficulties through hundreds of experiments with various processes and materials, enabling the bearing to have a long service life and high manufacturing precision.”