How many screws are there in the front shield of China Railway 6m shield machine?

64. According to the announcement of China Railway Engineering Group Co., Ltd., the front middle shield of 6m shield machine is equipped with 64 screws. China Railway Engineering Group Co., Ltd., referred to as "China Railway" for short, was established in March 1950 and its headquarters is in Beijing. It integrates infrastructure construction, survey, design and consulting services, engineering equipment and parts manufacturing, real estate development, railway and highway investment and operation.