precast

precast concrete beams.

预制的桁。

the floors were constructed by laying down precast concrete blocks.

地过铺设预制混凝土块建成的。

In harbour construction, precasting caissons with slipform construction technology is a new attempt.

港口施工中，利用滑模工艺预制沉箱一种新的尝试。

The technique of pier integral precasting at the sea was researched and applied in the innavigable section construction of Donghai Bridge(the first bridge at the sea in China).

海上墩柱整体预制吊装在我国第一座外海桥梁东海大桥非航段施工中得以研究和全应用。