A longitudinal concretecofferdam was demolished by way of underwater controlled blasting.
利用水下控制爆破方法拆除了大源渡河中的混凝土纵向围堰。
2
The second stage foundation pit of the TGP will be bounded by the upstream and downstream transverse cofferdams and the longitudinal concretecofferdam.
三峡工程二期上下游横向围堰与混凝土纵向围堰共同形成基坑,保证二期工程施工。
3
The concrete impervious wall for the second phase cofferdam in the Three Gorges Project is the key to the cofferdam.