Forgive me to nitpick on you. In CASC's presentation and state media reporting, 921 is called 超大型(super large), compared to CZ-5 as 大型(large), CZ-9 as 重型(heavy). Super-heavy in Chinese would be translated as 超重型, which in CASC's term would be much heavier than CZ-9, I would expecting something at least LEO 200t and above.A paper on the "thrust transmission structure" of China's upcoming superheavy rocket (a.k.a. the 921 rocket). The development is in full swing.
My technical Chinese is very limited in this area, so I'm not able to translate the paper. It does however have an English abstract.
The article is about the load baring structural design of the first stage. The design is compared with old design used by all CZ except CZ-4's upper stage (small). The old design distributes the force of the thrust to the tank wall through a mounting struct, the new design distributes the force to both the tank wall and the bulkhead. The new design (3310kg) saves 1 tonne of structural mass compared to the old (4330kg).
The photos in the article are of the static test article.