In order to control the subsidence of the interval tunnel and guarantee the safety of operation strictly, pipe-jacking is used as pre-support for the first time.

为了严格控制既有环线区间隧道的沉降，确保环线地铁运营安全，首次采用了顶管作超前预支护。

youdao

In order to control the subsidence of the interval tunnel and guarantee the safety of operation strictly, pipe-jacking is used as pre-support for the first time.

为了严格控制既有环线区间隧道的沉降，确保环线地铁运营安全，首次采用了顶管作超前预支护。

youdao