precast

precast concrete beams.

制水泥桁。

the floors were constructed by laying down precast concrete blocks.

地面是通过制混凝土块建成。

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

港口施中，利用滑模艺制沉箱是一种新尝试。

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).

海上墩柱整体制吊装在我国第一座外海桥梁东海大桥非通航段施中得以研究和全面应用。