noun
immersed tube method; sunk box culvert construction
A civil engineering method for building underwater tunnels by sinking prefabricated box culverts into a trench and joining them together.
東京湾アクアラインのトンネル部分は沈埋工法で建設された。
The tunnel section of the Tokyo Bay Aqua-Line was built using the immersed tube method.
シールド工法 (shield tunneling) uses a tunnel boring machine, while 沈埋工法 sinks prefabricated sections into a trench.
Compound of 沈 (sink), 埋 (bury), 工 (construction), and 法 (method). The term directly describes the construction technique.