cofferdam

IPA/ˈkɒf.ə.dæm/
IPA/ˈkɑː.fɚ.dæm/

cofferdam — noun

  • cofferdamsingular
  • cofferdamsplural

1. a strong temporary barrier built in a river, lake, or sea. Water is pumped out o

1.名詞C1
釋義

a strong temporary barrier built in a river, lake, or sea. Water is pumped out of it to create a dry space where construction or repair work can be done underwater.

例句

The engineering team built a cofferdam around the old bridge pier so workers could inspect the damage below the water.

cofferdam + around + for underwater inspection

Without a cofferdam, it would be impossible to build the foundation of the new port in deep water.

同義詞
  • caisson

    A caisson is a permanent prefabricated chamber, while a cofferdam is a temporary on-site barrier

用法筆記

Frequently used in civil engineering contexts. The term refers to the temporary barrier structure itself, not the dry area it creates. Do not confuse with caisson (沉箱), which is a permanent prefabricated structure sunk into place as part of the foundation.

常見錯誤

❌The divers swam inside the cofferdam to reach the riverbed.
✅Workers built a cofferdam and pumped out the water so they could work on the riverbed without diving gear.
💡A cofferdam is dewatered before anyone enters it.
❌The cofferdam blocked the whole river and created a lake.
✅The cofferdam created a dry area around the construction site by keeping water away.
💡A cofferdam is a temporary enclosure, not a large dam that stores water.