What does cofferdam mean?

Cofferdam means: it refers to the temporary enclosure structure built to build permanent water conservancy facilities in the construction of water conservancy projects.

Cofferdam wéiyàn[cofferdam coffer] A temporary impervious structure (such as sheet piles or metal plates filled with clay) built around the foundation pit construction area to be drained by the water in the construction area is generally used in hydraulic construction. Except as a part of formal buildings, the cofferdam is generally removed after it is used up. The height of cofferdam is higher than the highest water level that may occur during the construction period.

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1. The composition of the longitudinal cofferdam body and foundation of Feilaixia project in Beijiang River is complicated.

2. In view of the characteristics of tidal bore in Heshan Bay section of Qiantang River with low elevation of coating, this paper expounds the structural design of cofferdam, the technical measures adopted in cofferdam construction to promote the natural siltation of coating of Qiantang River and the cofferdam construction method.

3. Up to now, the bodies of the missing persons have been found in the Qingjiang mountain torrent disaster in Enshi, Hubei Province and the overflow of the cofferdam in Dalongtan Hydropower Project, and the whereabouts of children are unknown.

4. increase the throwing intensity, because of the rapid development of construction machinery, it can quickly intercept the river and speed up the cofferdam construction progress.

5. Search and rescue of overflow accident of Enshi cofferdam in Hubei Province: The whereabouts of children are still unknown.

6. The concrete longitudinal cofferdam in Dayuan River crossing was demolished by underwater controlled blasting.

7. The crest elevation of the upstream cofferdam is about the same, and the inclined core wall of gravel soil is used for seepage control of the weir body, and the plastic concrete seepage control wall is used for seepage control of the weir foundation.

8. The article introduces the construction situation and implementation effect of sand bag cofferdam in detail.

9. The reporter saw at the scene that the Xinkai River next to it has been leveled with the cofferdam on the south side of the tunnel after rising, and the water flows into the tunnel along the river from here.