Difference between cofferdams and caissons
Cofferdams and caissons are both structures that are used when undertaking construction works in areas submerged in under water.
The main difference between the two is that a cofferdam is a temporary structure which is removed after completion of the work, whereas a caisson is built to remain in place as part of the completed structure.
The aim of a cofferdam is to be as watertight as possible to create a dry area in which to carry out the required works, or at least to limit water ingress to a safe level that can be pumped away.
A caisson is typically a box-like structure made of materials such as timber, steel, masonry and reinforced concrete. It may be constructed onshore then floated to the required location, where it is sunk into place, enabling access to the bed to undertake works.
The type of structure being built will determine whether a caisson or a cofferdam is most suitable. The two principal factors influencing the choice are the ground conditions and the depth to which the work is to be taken. In general, cofferdams are suitable for depths of up to 18 m below high water level, while caissons are more suitable for greater depths.
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Corruption in the construction industry.
What will it take to stop it ?
To celebrate world bee day 2022 !
Just one month until the changes to part L come into effect.
Not forgetting part F and the new part overheating part O.
Heat Pump demand rises by one quarter.
As energy prices jump up in cost.
With people in the UK from Ukraine.
Industry leader Steve Murray takes on role.
An abundant and versatile building material.
How overheating complicates ending gas in the UK.
600,000 heat pump installations targeted per year by 2028.
Cost planning, control and related articles on DB.
Helping prevent those unwanted outcomes.
ICE debate Public transport - post pandemic.
How has transport changed due to Covid-19 ?
Cross-ventilation in buildings. Do you have it ?
Will you need it ? after June 15 and the new Part O ?
Share your knowledge with the industry.
Create an account and write the first of many articles.
The green jobs delivery group.
CIAT commentary after the first meeting.
Liverpool's world heritage site status
Who is to blame?
Research recommends focussing on portfolio success rather than project success.
ICE and BSI launch revised PAS 128 standard.
The revised standard for mapping underground utilities.
Launching the UK net zero carbon buildings standard.
Cross-industry steering group seeks support in delivery.